private com.google.protobuf.SingleFieldBuilderV3<
            com.google.protobuf.Timestamp,
            com.google.protobuf.Timestamp.Builder,
            com.google.protobuf.TimestampOrBuilder>
        getExpireTimeFieldBuilder() {
      if (expireTimeBuilder_ == null) {
        expireTimeBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.protobuf.Timestamp,
                com.google.protobuf.Timestamp.Builder,
                com.google.protobuf.TimestampOrBuilder>(
                getExpireTime(), getParentForChildren(), isClean());
        expireTime_ = null;
      }
      return expireTimeBuilder_;
    }
<pre>
Output only. The time at which this Recognizer will be purged.
</pre>

<code>
.google.protobuf.Timestamp expire_time = 14 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/Recognizer.java