public Builder setSpeechContexts(
        int index, com.google.cloud.videointelligence.v1.SpeechContext value) {
      if (speechContextsBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureSpeechContextsIsMutable();
        speechContexts_.set(index, value);
        onChanged();
      } else {
        speechContextsBuilder_.setMessage(index, value);
      }
      return this;
    }
<pre>
Optional. A means to provide context to assist the speech recognition.
</pre>

<code>
repeated .google.cloud.videointelligence.v1.SpeechContext speech_contexts = 4 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-video-intelligence/proto-google-cloud-video-intelligence-v1/src/main/java/com/google/cloud/videointelligence/v1/SpeechTranscriptionConfig.java