public Builder mergeExpireTime(com.google.protobuf.Timestamp value) {
      if (expireTimeBuilder_ == null) {
        if (((bitField0_ & 0x00000800) != 0)
            && expireTime_ != null
            && expireTime_ != com.google.protobuf.Timestamp.getDefaultInstance()) {
          getExpireTimeBuilder().mergeFrom(value);
        } else {
          expireTime_ = value;
        }
      } else {
        expireTimeBuilder_.mergeFrom(value);
      }
      if (expireTime_ != null) {
        bitField0_ |= 0x00000800;
        onChanged();
      }
      return this;
    }
<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