public com.google.protobuf.FieldMaskOrBuilder getReadMaskOrBuilder() {
      if (readMaskBuilder_ != null) {
        return readMaskBuilder_.getMessageOrBuilder();
      } else {
        return readMask_ == null ? com.google.protobuf.FieldMask.getDefaultInstance() : readMask_;
      }
    }
<pre>
Optional. Mask specifying which fields to read.
</pre>

<code>.google.protobuf.FieldMask read_mask = 5 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/ListEndpointsRequest.java