private void ensureRestrictionsIsMutable() {
      if (!((bitField0_ & 0x00000004) != 0)) {
        restrictions_ =
            new java.util.ArrayList<com.google.cloud.vertexai.api.ExamplesRestrictionsNamespace>(
                restrictions_);
        bitField0_ |= 0x00000004;
      }
    }
<pre>
The number of neighbors to return that have the same crowding tag.
</pre>

<code>int32 crowding_count = 2;</code>

@return This builder for chaining.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/ExamplesOverride.java