• collection: A mongoc_collection_t.
• index_name: A string containing the name of the index.
• error: An optional location for a bson_error_t or NULL.
opts may be NULL or a BSON document with additional command options:
• writeConcern: Construct a mongoc_write_concern_t and use mongoc_write_concern_append() to add the write
concern to opts. See the example code for mongoc_client_write_command_with_opts().
• sessionId: First, construct a mongoc_client_session_t with mongoc_client_start_session(). You can begin
a transaction with mongoc_client_session_start_transaction(), optionally with a
mongoc_transaction_opt_t that overrides the options inherited from collection, and use
mongoc_client_session_append() to add the session to opts. See the example code for
mongoc_client_session_t.
• collation: Configure textual comparisons. See SettingCollationOrder, and theMongoDBManualentryonCollation. Collation requires MongoDB 3.2 or later, otherwise an error is returned.
• serverId: To target a specific server, include an int32 "serverId" field. Obtain the id by calling
mongoc_client_select_server(), then mongoc_server_description_id() on its return value.