Indicates the type of endpointer event.

ENDPOINTER_EVENT_UNSPECIFIED No endpointer event specified.
START_OF_SPEECH Speech has been detected in the audio stream.
END_OF_SPEECH Speech has ceased to be detected in the audio stream.
END_OF_AUDIO The end of the audio stream has been reached. and it is being processed.
END_OF_UTTERANCE This event is only sent when singleUtterance is true. It indicates that the server has detected the end of the user's speech utterance and expects no additional speech. Therefore, the server will not process additional audio (although it may subsequently return additional results). The client should stop sending additional audio data, half-close the gRPC connection, and wait for any additional results until the server closes the gRPC connection.
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