code: public Set<BsonValue> getSynchronizedDocumentIds(final MongoNamespace namespace) {
      try {
        return getNamespaceConfig(namespace).getSynchronizedDocumentIds();
      } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
        return new HashSet<>();
      }
    }
docs: Returns the set of synchronized documents _ids in a namespace.
  
  @param namespace the namespace to get synchronized documents _ids for.
  @return the set of synchronized documents _ids in a namespace.