@Override
    public String toString() {
        return "ChangeStreamDescriptor{"
                + "database='"
                + database
                + '\''
                + ", collection='"
                + collection
                + '\''
                + ", databaseRegex="
                + databaseRegex
                + ", namespaceRegex="
                + namespaceRegex
                + '}';
    }
A structure describes a filter of change stream targets.
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/offset/ChangeStreamDescriptor.java