private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.video.livestream.v1.Pool,
            com.google.cloud.video.livestream.v1.Pool.Builder,
            com.google.cloud.video.livestream.v1.PoolOrBuilder>
        getPoolFieldBuilder() {
      if (poolBuilder_ == null) {
        poolBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.video.livestream.v1.Pool,
                com.google.cloud.video.livestream.v1.Pool.Builder,
                com.google.cloud.video.livestream.v1.PoolOrBuilder>(
                getPool(), getParentForChildren(), isClean());
        pool_ = null;
      }
      return poolBuilder_;
    }
<pre>
Required. The pool resource to be updated.
</pre>

<code>
.google.cloud.video.livestream.v1.Pool pool = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/UpdatePoolRequest.java