private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.speech.v2.LanguageMetadata,
            com.google.cloud.speech.v2.LanguageMetadata.Builder,
            com.google.cloud.speech.v2.LanguageMetadataOrBuilder>
        getLanguagesFieldBuilder() {
      if (languagesBuilder_ == null) {
        languagesBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.speech.v2.LanguageMetadata,
                com.google.cloud.speech.v2.LanguageMetadata.Builder,
                com.google.cloud.speech.v2.LanguageMetadataOrBuilder>(
                getLanguages(), getParentForChildren(), isClean());
        languages_ = null;
      }
      return languagesBuilder_;
    }
<pre>
Information about available locales, models, and features represented in
the hierarchical structure of locales -&gt; models -&gt; features
</pre>

<code>.google.cloud.speech.v2.LanguageMetadata languages = 1;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/LocationsMetadata.java