private StreamSplit createBackfillStreamSplit(
            ChangeStreamOffset lowWatermark, ChangeStreamOffset highWatermark) {
        return new StreamSplit(
                snapshotSplit.splitId(),
                lowWatermark,
                highWatermark,
                new ArrayList<>(),
                snapshotSplit.getTableSchemas(),
                0);
    }
The task to work for fetching data of MongoDB collection snapshot split .
Copy from com.ververica:flink-connector-mongodb-cdc:2.3.0.
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/mongodb-cdc/src/main/java/org/apache/inlong/sort/cdc/mongodb/source/reader/fetch/MongoDBScanFetchTask.java