@java.lang.Override
  public int getSerializedSize() {
    int size = memoizedSize;
    if (size != -1) return size;

    size = 0;
    if (sourceCase_ == 2) {
      size +=
          com.google.protobuf.CodedOutputStream.computeMessageSize(
              2, (com.google.cloud.vertexai.api.VertexAISearch) source_);
    }
    if (disableAttribution_ != false) {
      size += com.google.protobuf.CodedOutputStream.computeBoolSize(3, disableAttribution_);
    }
    if (sourceCase_ == 4) {
      size +=
          com.google.protobuf.CodedOutputStream.computeMessageSize(
              4, (com.google.cloud.vertexai.api.VertexRagStore) source_);
    }
    size += getUnknownFields().getSerializedSize();
    memoizedSize = size;
    return size;
  }
<pre>
Optional. Deprecated. This option is no longer supported.
</pre>

<code>
bool disable_attribution = 3 [deprecated = true, (.google.api.field_behavior) = OPTIONAL];
</code>

@deprecated google.cloud.vertexai.v1.Retrieval.disable_attribution is deprecated. See
    google/cloud/vertexai/v1/tool.proto;l=219
@return The disableAttribution.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Retrieval.java