private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.visionai.v1.ImageQuery,
            com.google.cloud.visionai.v1.ImageQuery.Builder,
            com.google.cloud.visionai.v1.ImageQueryOrBuilder>
        getImageQueryFieldBuilder() {
      if (imageQueryBuilder_ == null) {
        if (!(queryCase_ == 2)) {
          query_ = com.google.cloud.visionai.v1.ImageQuery.getDefaultInstance();
        }
        imageQueryBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.visionai.v1.ImageQuery,
                com.google.cloud.visionai.v1.ImageQuery.Builder,
                com.google.cloud.visionai.v1.ImageQueryOrBuilder>(
                (com.google.cloud.visionai.v1.ImageQuery) query_,
                getParentForChildren(),
                isClean());
        query_ = null;
      }
      queryCase_ = 2;
      onChanged();
      return imageQueryBuilder_;
    }
<pre>
An image-only query.
</pre>

<code>.google.cloud.visionai.v1.ImageQuery image_query = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/SearchIndexEndpointRequest.java