private void ensureDeployedIndexesIsMutable() {
      if (!((bitField0_ & 0x00000080) != 0)) {
        deployedIndexes_ =
            new java.util.ArrayList<com.google.cloud.visionai.v1.DeployedIndexReference>(
                deployedIndexes_);
        bitField0_ |= 0x00000080;
      }
    }
<pre>
Output only. The update timestamp.
</pre>

<code>
.google.protobuf.Timestamp update_time = 6 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/Index.java