code: public final ListAnnotationSpecSetsPagedResponse listAnnotationSpecSets(
        String parent, String filter) {
      PROJECT_PATH_TEMPLATE.validate(parent, "listAnnotationSpecSets");
      ListAnnotationSpecSetsRequest request =
          ListAnnotationSpecSetsRequest.newBuilder().setParent(parent).setFilter(filter).build();
      return listAnnotationSpecSets(request);
    }
docs: Lists annotation spec sets for a project. Pagination is supported.
  
  <p>Sample code:
  
  <pre><code>
  try (DataLabelingServiceClient dataLabelingServiceClient = DataLabelingServiceClient.create()) {
  String formattedParent = DataLabelingServiceClient.formatProjectName("[PROJECT]");
  String filter = "";
  for (AnnotationSpecSet element : dataLabelingServiceClient.listAnnotationSpecSets(formattedParent, filter).iterateAll()) {
  // doThingsWith(element);
  }
  }
  </code></pre>
  
  @param parent Required. Parent of AnnotationSpecSet resource, format: projects/{project_id}
  @param filter Optional. Filter is not supported at this moment.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails