public Builder clearWritesDoneGracePeriod() {
        bitField0_ = (bitField0_ & ~0x00000020);
        writesDoneGracePeriod_ = null;
        if (writesDoneGracePeriodBuilder_ != null) {
          writesDoneGracePeriodBuilder_.dispose();
          writesDoneGracePeriodBuilder_ = null;
        }
        onChanged();
        return this;
      }
<pre>
The grace period after which a `writes_done_request` is issued, that a
`WritesDone` is expected from the client.

The server is free to cancel the RPC should this expire.

A system default will be chosen if unset.
</pre>

<code>.google.protobuf.Duration writes_done_grace_period = 6;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ReceiveEventsRequest.java