diff --git a/test/test_transactions.py b/test/test_transactions.py
index 715789af4..6d52e5e84 100644
--- a/test/test_transactions.py
+++ b/test/test_transactions.py
@@ -138,15 +138,23 @@ class TestTransactions(IntegrationTest):
 
         # Convert arguments to snake_case and handle special cases.
         arguments = operation['arguments']
-        options = arguments.pop("options", {})
-        for option_name in options:
-            arguments[camel_to_snake(option_name)] = options[option_name]
-
         pref = arguments.pop('readPreference', None)
         if pref:
             mode = read_pref_mode_from_name(pref['mode'])
             collection = collection.with_options(
                 read_preference=make_read_preference(mode, None))
+        write_c = arguments.pop('writeConcern', None)
+        if write_c:
+            collection = collection.with_options(
+                write_concern=WriteConcern(**write_c))
+        read_c = arguments.pop('readConcern', None)
+        if read_c:
+            collection = collection.with_options(
+                read_concern=ReadConcern(**read_c))
+
+        options = arguments.pop("options", {})
+        for option_name in options:
+            arguments[camel_to_snake(option_name)] = options[option_name]
 
         if name.endswith('_transaction'):
             cmd = getattr(session, name)
@@ -181,9 +189,9 @@ class TestTransactions(IntegrationTest):
                 # Requires boolean returnDocument.
                 elif arg_name == "returnDocument":
                     arguments[c2s] = arguments[arg_name] == "After"
-                elif arg_name == "readConcern":
+                elif c2s == "read_concern":
                     arguments[c2s] = ReadConcern(**arguments.pop(arg_name))
-                elif arg_name == "writeConcern":
+                elif c2s == "write_concern":
                     arguments[c2s] = WriteConcern(**arguments.pop(arg_name))
                 else:
                     arguments[c2s] = arguments.pop(arg_name)
diff --git a/test/transactions/auto-start.json b/test/transactions/auto-start.json
index 0b75b9f4c..cd0115275 100644
--- a/test/transactions/auto-start.json
+++ b/test/transactions/auto-start.json
@@ -380,6 +380,7 @@
                 "level": "snapshot",
                 "afterClusterTime": 42
               },
+              "lsid": "session0",
               "txnNumber": {
                 "$numberLong": "2"
               },
@@ -456,9 +457,6 @@
           "name": "commitTransaction",
           "arguments": {
             "session": "session0"
-          },
-          "result": {
-            "errorContains": "no transaction started"
           }
         }
       ],
diff --git a/test/transactions/bulk.json b/test/transactions/bulk.json
index 942014f49..d16a79f0e 100644
--- a/test/transactions/bulk.json
+++ b/test/transactions/bulk.json
@@ -510,6 +510,104 @@
           ]
         }
       }
+    },
+    {
+      "description": "operation writeConcern ignored for bulk",
+      "operations": [
+        {
+          "name": "startTransaction",
+          "arguments": {
+            "session": "session0",
+            "options": {
+              "writeConcern": {
+                "w": "majority"
+              }
+            }
+          }
+        },
+        {
+          "name": "bulkWrite",
+          "arguments": {
+            "requests": [
+              {
+                "name": "insertOne",
+                "arguments": {
+                  "document": {
+                    "_id": 1
+                  }
+                }
+              }
+            ],
+            "writeConcern": {
+              "w": "majority"
+            },
+            "session": "session0"
+          },
+          "result": {
+            "deletedCount": 0,
+            "insertedIds": {
+              "0": 1
+            },
+            "matchedCount": 0,
+            "modifiedCount": 0,
+            "upsertedCount": 0,
+            "upsertedIds": {}
+          }
+        },
+        {
+          "name": "commitTransaction",
+          "arguments": {
+            "session": "session0"
+          }
+        }
+      ],
+      "expectations": [
+        {
+          "command_started_event": {
+            "command": {
+              "insert": "test",
+              "documents": [
+                {
+                  "_id": 1
+                }
+              ],
+              "ordered": true,
+              "readConcern": {
+                "level": "snapshot"
+              },
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 0,
+              "startTransaction": true,
+              "autocommit": false,
+              "writeConcern": null
+            },
+            "command_name": "insert",
+            "database_name": "transaction-tests"
+          }
+        },
+        {
+          "command_started_event": {
+            "command": {
+              "commitTransaction": 1,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 1,
+              "startTransaction": null,
+              "autocommit": false,
+              "writeConcern": {
+                "w": "majority"
+              }
+            },
+            "command_name": "commitTransaction",
+            "database_name": "admin"
+          }
+        }
+      ]
     }
   ]
 }
diff --git a/test/transactions/delete.json b/test/transactions/delete.json
index 8c8881623..415fa92c3 100644
--- a/test/transactions/delete.json
+++ b/test/transactions/delete.json
@@ -182,6 +182,138 @@
           ]
         }
       }
+    },
+    {
+      "description": "operation writeConcern ignored for delete",
+      "operations": [
+        {
+          "name": "startTransaction",
+          "arguments": {
+            "session": "session0",
+            "options": {
+              "writeConcern": {
+                "w": "majority"
+              }
+            }
+          }
+        },
+        {
+          "name": "deleteOne",
+          "arguments": {
+            "filter": {
+              "_id": 1
+            },
+            "writeConcern": {
+              "w": "majority"
+            },
+            "session": "session0"
+          },
+          "result": {
+            "deletedCount": 1
+          }
+        },
+        {
+          "name": "deleteMany",
+          "arguments": {
+            "filter": {
+              "_id": {
+                "$lte": 3
+              }
+            },
+            "writeConcern": {
+              "w": "majority"
+            },
+            "session": "session0"
+          },
+          "result": {
+            "deletedCount": 2
+          }
+        },
+        {
+          "name": "commitTransaction",
+          "arguments": {
+            "session": "session0"
+          }
+        }
+      ],
+      "expectations": [
+        {
+          "command_started_event": {
+            "command": {
+              "delete": "test",
+              "deletes": [
+                {
+                  "q": {
+                    "_id": 1
+                  },
+                  "limit": 1
+                }
+              ],
+              "ordered": true,
+              "readConcern": {
+                "level": "snapshot"
+              },
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 0,
+              "startTransaction": true,
+              "autocommit": false,
+              "writeConcern": null
+            },
+            "command_name": "delete",
+            "database_name": "transaction-tests"
+          }
+        },
+        {
+          "command_started_event": {
+            "command": {
+              "delete": "test",
+              "deletes": [
+                {
+                  "q": {
+                    "_id": {
+                      "$lte": 3
+                    }
+                  },
+                  "limit": 0
+                }
+              ],
+              "ordered": true,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 1,
+              "startTransaction": null,
+              "autocommit": false,
+              "writeConcern": null
+            },
+            "command_name": "delete",
+            "database_name": "transaction-tests"
+          }
+        },
+        {
+          "command_started_event": {
+            "command": {
+              "commitTransaction": 1,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 2,
+              "startTransaction": null,
+              "autocommit": false,
+              "writeConcern": {
+                "w": "majority"
+              }
+            },
+            "command_name": "commitTransaction",
+            "database_name": "admin"
+          }
+        }
+      ]
     }
   ]
 }
diff --git a/test/transactions/findOneAndDelete.json b/test/transactions/findOneAndDelete.json
index 6bdabf974..8cd21f120 100644
--- a/test/transactions/findOneAndDelete.json
+++ b/test/transactions/findOneAndDelete.json
@@ -127,6 +127,89 @@
           ]
         }
       }
+    },
+    {
+      "description": "operation writeConcern ignored for findOneAndDelete",
+      "operations": [
+        {
+          "name": "startTransaction",
+          "arguments": {
+            "session": "session0",
+            "options": {
+              "writeConcern": {
+                "w": "majority"
+              }
+            }
+          }
+        },
+        {
+          "name": "findOneAndDelete",
+          "arguments": {
+            "filter": {
+              "_id": 3
+            },
+            "session": "session0",
+            "writeConcern": {
+              "w": "majority"
+            }
+          },
+          "result": {
+            "_id": 3
+          }
+        },
+        {
+          "name": "commitTransaction",
+          "arguments": {
+            "session": "session0"
+          }
+        }
+      ],
+      "expectations": [
+        {
+          "command_started_event": {
+            "command": {
+              "findAndModify": "test",
+              "query": {
+                "_id": 3
+              },
+              "remove": true,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 0,
+              "startTransaction": true,
+              "autocommit": false,
+              "readConcern": {
+                "level": "snapshot"
+              },
+              "writeConcern": null
+            },
+            "command_name": "findAndModify",
+            "database_name": "transaction-tests"
+          }
+        },
+        {
+          "command_started_event": {
+            "command": {
+              "commitTransaction": 1,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 1,
+              "startTransaction": null,
+              "autocommit": false,
+              "readConcern": null,
+              "writeConcern": {
+                "w": "majority"
+              }
+            },
+            "command_name": "commitTransaction",
+            "database_name": "admin"
+          }
+        }
+      ]
     }
   ]
 }
diff --git a/test/transactions/findOneAndReplace.json b/test/transactions/findOneAndReplace.json
index a2a4fbd79..a920f7b93 100644
--- a/test/transactions/findOneAndReplace.json
+++ b/test/transactions/findOneAndReplace.json
@@ -154,6 +154,96 @@
           ]
         }
       }
+    },
+    {
+      "description": "operation writeConcern ignored for findOneAndReplace",
+      "operations": [
+        {
+          "name": "startTransaction",
+          "arguments": {
+            "session": "session0",
+            "options": {
+              "writeConcern": {
+                "w": "majority"
+              }
+            }
+          }
+        },
+        {
+          "name": "findOneAndReplace",
+          "arguments": {
+            "filter": {
+              "_id": 3
+            },
+            "replacement": {
+              "x": 1
+            },
+            "returnDocument": "Before",
+            "session": "session0",
+            "writeConcern": {
+              "w": "majority"
+            }
+          },
+          "result": {
+            "_id": 3
+          }
+        },
+        {
+          "name": "commitTransaction",
+          "arguments": {
+            "session": "session0"
+          }
+        }
+      ],
+      "expectations": [
+        {
+          "command_started_event": {
+            "command": {
+              "findAndModify": "test",
+              "query": {
+                "_id": 3
+              },
+              "update": {
+                "x": 1
+              },
+              "new": false,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 0,
+              "startTransaction": true,
+              "autocommit": false,
+              "readConcern": {
+                "level": "snapshot"
+              },
+              "writeConcern": null
+            },
+            "command_name": "findAndModify",
+            "database_name": "transaction-tests"
+          }
+        },
+        {
+          "command_started_event": {
+            "command": {
+              "commitTransaction": 1,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 1,
+              "startTransaction": null,
+              "autocommit": false,
+              "readConcern": null,
+              "writeConcern": {
+                "w": "majority"
+              }
+            },
+            "command_name": "commitTransaction",
+            "database_name": "admin"
+          }
+        }
+      ]
     }
   ]
 }
diff --git a/test/transactions/findOneAndUpdate.json b/test/transactions/findOneAndUpdate.json
index 8965737ae..1b769d35d 100644
--- a/test/transactions/findOneAndUpdate.json
+++ b/test/transactions/findOneAndUpdate.json
@@ -320,6 +320,100 @@
           ]
         }
       }
+    },
+    {
+      "description": "operation writeConcern ignored for findOneAndUpdate",
+      "operations": [
+        {
+          "name": "startTransaction",
+          "arguments": {
+            "session": "session0",
+            "options": {
+              "writeConcern": {
+                "w": "majority"
+              }
+            }
+          }
+        },
+        {
+          "name": "findOneAndUpdate",
+          "arguments": {
+            "filter": {
+              "_id": 3
+            },
+            "update": {
+              "$inc": {
+                "x": 1
+              }
+            },
+            "returnDocument": "Before",
+            "session": "session0",
+            "writeConcern": {
+              "w": "majority"
+            }
+          },
+          "result": {
+            "_id": 3
+          }
+        },
+        {
+          "name": "commitTransaction",
+          "arguments": {
+            "session": "session0"
+          }
+        }
+      ],
+      "expectations": [
+        {
+          "command_started_event": {
+            "command": {
+              "findAndModify": "test",
+              "query": {
+                "_id": 3
+              },
+              "update": {
+                "$inc": {
+                  "x": 1
+                }
+              },
+              "new": false,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 0,
+              "startTransaction": true,
+              "autocommit": false,
+              "readConcern": {
+                "level": "snapshot"
+              },
+              "writeConcern": null
+            },
+            "command_name": "findAndModify",
+            "database_name": "transaction-tests"
+          }
+        },
+        {
+          "command_started_event": {
+            "command": {
+              "commitTransaction": 1,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 1,
+              "startTransaction": null,
+              "autocommit": false,
+              "readConcern": null,
+              "writeConcern": {
+                "w": "majority"
+              }
+            },
+            "command_name": "commitTransaction",
+            "database_name": "admin"
+          }
+        }
+      ]
     }
   ]
 }
diff --git a/test/transactions/insert.json b/test/transactions/insert.json
index 137200cd9..67840cccb 100644
--- a/test/transactions/insert.json
+++ b/test/transactions/insert.json
@@ -243,6 +243,139 @@
           ]
         }
       }
+    },
+    {
+      "description": "operation writeConcern ignored for insert",
+      "operations": [
+        {
+          "name": "startTransaction",
+          "arguments": {
+            "session": "session0",
+            "options": {
+              "writeConcern": {
+                "w": "majority"
+              }
+            }
+          }
+        },
+        {
+          "name": "insertOne",
+          "arguments": {
+            "document": {
+              "_id": 1
+            },
+            "session": "session0",
+            "writeConcern": {
+              "w": "majority"
+            }
+          },
+          "result": {
+            "insertedId": 1
+          }
+        },
+        {
+          "name": "insertMany",
+          "arguments": {
+            "documents": [
+              {
+                "_id": 2
+              },
+              {
+                "_id": 3
+              }
+            ],
+            "session": "session0",
+            "writeConcern": {
+              "w": "majority"
+            }
+          },
+          "result": {
+            "insertedIds": {
+              "0": 2,
+              "1": 3
+            }
+          }
+        },
+        {
+          "name": "commitTransaction",
+          "arguments": {
+            "session": "session0"
+          }
+        }
+      ],
+      "expectations": [
+        {
+          "command_started_event": {
+            "command": {
+              "insert": "test",
+              "documents": [
+                {
+                  "_id": 1
+                }
+              ],
+              "ordered": true,
+              "readConcern": {
+                "level": "snapshot"
+              },
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 0,
+              "startTransaction": true,
+              "autocommit": false,
+              "writeConcern": null
+            },
+            "command_name": "insert",
+            "database_name": "transaction-tests"
+          }
+        },
+        {
+          "command_started_event": {
+            "command": {
+              "insert": "test",
+              "documents": [
+                {
+                  "_id": 2
+                },
+                {
+                  "_id": 3
+                }
+              ],
+              "ordered": true,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 1,
+              "startTransaction": null,
+              "autocommit": false,
+              "writeConcern": null
+            },
+            "command_name": "insert",
+            "database_name": "transaction-tests"
+          }
+        },
+        {
+          "command_started_event": {
+            "command": {
+              "commitTransaction": 1,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 3,
+              "startTransaction": null,
+              "autocommit": false,
+              "writeConcern": {
+                "w": "majority"
+              }
+            },
+            "command_name": "commitTransaction",
+            "database_name": "admin"
+          }
+        }
+      ]
     }
   ]
 }
diff --git a/test/transactions/read-pref.json b/test/transactions/read-pref.json
index 021b62879..855d7822b 100644
--- a/test/transactions/read-pref.json
+++ b/test/transactions/read-pref.json
@@ -82,7 +82,7 @@
             "session": "session0"
           },
           "result": {
-            "errorContains": "transaction readPreference changed"
+            "errorContains": "read preference in a transaction must be primary"
           }
         },
         {
@@ -102,6 +102,40 @@
         }
       }
     },
+    {
+      "description": "non-primary readPreference",
+      "operations": [
+        {
+          "name": "startTransaction",
+          "arguments": {
+            "session": "session0"
+          }
+        },
+        {
+          "name": "count",
+          "arguments": {
+            "readPreference": {
+              "mode": "secondary"
+            },
+            "session": "session0"
+          },
+          "result": {
+            "errorContains": "read preference in a transaction must be primary"
+          }
+        },
+        {
+          "name": "commitTransaction",
+          "arguments": {
+            "session": "session0"
+          }
+        }
+      ],
+      "outcome": {
+        "collection": {
+          "data": []
+        }
+      }
+    },
     {
       "description": "conflict",
       "operations": [
@@ -130,7 +164,7 @@
             "session": "session0"
           },
           "result": {
-            "errorContains": "transaction readPreference changed"
+            "errorContains": "read preference in a transaction must be primary"
           }
         },
         {
diff --git a/test/transactions/reads.json b/test/transactions/reads.json
index 159cb5d7c..2c7eac92a 100644
--- a/test/transactions/reads.json
+++ b/test/transactions/reads.json
@@ -13,20 +13,6 @@
       "_id": 4
     }
   ],
-  "common": [
-    {
-      "name": "startTransaction",
-      "arguments": {
-        "session": "session0"
-      }
-    },
-    {
-      "name": "commitTransaction",
-      "arguments": {
-        "session": "session0"
-      }
-    }
-  ],
   "tests": [
     {
       "description": "count",
diff --git a/test/transactions/transaction-options.json b/test/transactions/transaction-options.json
index 1b76847fc..5d882a244 100644
--- a/test/transactions/transaction-options.json
+++ b/test/transactions/transaction-options.json
@@ -506,11 +506,13 @@
           "name": "startTransaction",
           "arguments": {
             "session": "session0",
-            "readConcern": {
-              "level": "snapshot"
-            },
-            "writeConcern": {
-              "w": "majority"
+            "options": {
+              "readConcern": {
+                "level": "snapshot"
+              },
+              "writeConcern": {
+                "w": "majority"
+              }
             }
           }
         },
@@ -536,11 +538,13 @@
           "name": "startTransaction",
           "arguments": {
             "session": "session0",
-            "readConcern": {
-              "level": "snapshot"
-            },
-            "writeConcern": {
-              "w": "majority"
+            "options": {
+              "readConcern": {
+                "level": "snapshot"
+              },
+              "writeConcern": {
+                "w": "majority"
+              }
             }
           }
         },
diff --git a/test/transactions/update.json b/test/transactions/update.json
index a2cc4c19c..db4a23c98 100644
--- a/test/transactions/update.json
+++ b/test/transactions/update.json
@@ -225,6 +225,216 @@
           ]
         }
       }
+    },
+    {
+      "description": "operation writeConcern ignored for update",
+      "operations": [
+        {
+          "name": "startTransaction",
+          "arguments": {
+            "session": "session0",
+            "options": {
+              "writeConcern": {
+                "w": "majority"
+              }
+            }
+          }
+        },
+        {
+          "name": "updateOne",
+          "arguments": {
+            "filter": {
+              "_id": 4
+            },
+            "update": {
+              "$inc": {
+                "x": 1
+              }
+            },
+            "upsert": true,
+            "writeConcern": {
+              "w": "majority"
+            },
+            "session": "session0"
+          },
+          "result": {
+            "matchedCount": 0,
+            "modifiedCount": 0,
+            "upsertedCount": 1,
+            "upsertedId": 4
+          }
+        },
+        {
+          "name": "replaceOne",
+          "arguments": {
+            "filter": {
+              "x": 1
+            },
+            "replacement": {
+              "y": 1
+            },
+            "writeConcern": {
+              "w": "majority"
+            },
+            "session": "session0"
+          },
+          "result": {
+            "matchedCount": 1,
+            "modifiedCount": 1,
+            "upsertedCount": 0
+          }
+        },
+        {
+          "name": "updateMany",
+          "arguments": {
+            "filter": {
+              "_id": {
+                "$gte": 3
+              }
+            },
+            "update": {
+              "$set": {
+                "z": 1
+              }
+            },
+            "writeConcern": {
+              "w": "majority"
+            },
+            "session": "session0"
+          },
+          "result": {
+            "matchedCount": 2,
+            "modifiedCount": 2,
+            "upsertedCount": 0
+          }
+        },
+        {
+          "name": "commitTransaction",
+          "arguments": {
+            "session": "session0"
+          }
+        }
+      ],
+      "expectations": [
+        {
+          "command_started_event": {
+            "command": {
+              "update": "test",
+              "updates": [
+                {
+                  "q": {
+                    "_id": 4
+                  },
+                  "u": {
+                    "$inc": {
+                      "x": 1
+                    }
+                  },
+                  "multi": false,
+                  "upsert": true
+                }
+              ],
+              "ordered": true,
+              "readConcern": {
+                "level": "snapshot"
+              },
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 0,
+              "startTransaction": true,
+              "autocommit": false,
+              "writeConcern": null
+            },
+            "command_name": "update",
+            "database_name": "transaction-tests"
+          }
+        },
+        {
+          "command_started_event": {
+            "command": {
+              "update": "test",
+              "updates": [
+                {
+                  "q": {
+                    "x": 1
+                  },
+                  "u": {
+                    "y": 1
+                  },
+                  "multi": false,
+                  "upsert": false
+                }
+              ],
+              "ordered": true,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 1,
+              "startTransaction": null,
+              "autocommit": false,
+              "writeConcern": null
+            },
+            "command_name": "update",
+            "database_name": "transaction-tests"
+          }
+        },
+        {
+          "command_started_event": {
+            "command": {
+              "update": "test",
+              "updates": [
+                {
+                  "q": {
+                    "_id": {
+                      "$gte": 3
+                    }
+                  },
+                  "u": {
+                    "$set": {
+                      "z": 1
+                    }
+                  },
+                  "multi": true,
+                  "upsert": false
+                }
+              ],
+              "ordered": true,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 2,
+              "startTransaction": null,
+              "autocommit": false,
+              "writeConcern": null
+            },
+            "command_name": "update",
+            "database_name": "transaction-tests"
+          }
+        },
+        {
+          "command_started_event": {
+            "command": {
+              "commitTransaction": 1,
+              "lsid": "session0",
+              "txnNumber": {
+                "$numberLong": "1"
+              },
+              "stmtId": 3,
+              "startTransaction": null,
+              "autocommit": false,
+              "writeConcern": {
+                "w": "majority"
+              }
+            },
+            "command_name": "commitTransaction",
+            "database_name": "admin"
+          }
+        }
+      ]
     }
   ]
 }
diff --git a/test/transactions/write-concern.json b/test/transactions/write-concern.json
index 3effa6bdb..bac1a52e4 100644
--- a/test/transactions/write-concern.json
+++ b/test/transactions/write-concern.json
@@ -8,8 +8,10 @@
           "name": "startTransaction",
           "arguments": {
             "session": "session0",
-            "writeConcern": {
-              "w": "majority"
+            "options": {
+              "writeConcern": {
+                "w": "majority"
+              }
             }
           }
         },
@@ -179,8 +181,10 @@
           "name": "startTransaction",
           "arguments": {
             "session": "session0",
-            "writeConcern": {
-              "w": "majority"
+            "options": {
+              "writeConcern": {
+                "w": "majority"
+              }
             }
           }
         },