private void ensureGroundingChunksIsMutable() {
      if (!((bitField0_ & 0x00000004) != 0)) {
        groundingChunks_ =
            new java.util.ArrayList<com.google.cloud.vertexai.api.GroundingChunk>(groundingChunks_);
        bitField0_ |= 0x00000004;
      }
    }
<pre>
Optional. Google search entry for the following-up web searches.
</pre>

<code>
optional .google.cloud.vertexai.v1.SearchEntryPoint search_entry_point = 4 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GroundingMetadata.java