public Builder clearPullTarget() {
      if (pullTargetBuilder_ == null) {
        if (targetTypeCase_ == 4) {
          targetTypeCase_ = 0;
          targetType_ = null;
          onChanged();
        }
      } else {
        if (targetTypeCase_ == 4) {
          targetTypeCase_ = 0;
          targetType_ = null;
        }
        pullTargetBuilder_.clear();
      }
      return this;
    }
<pre>
Pull target.

A pull queue is a queue that has a
[PullTarget][google.cloud.tasks.v2beta2.PullTarget].
</pre>

<code>.google.cloud.tasks.v2beta2.PullTarget pull_target = 4;</code>
java-tasks/proto-google-cloud-tasks-v2beta2/src/main/java/com/google/cloud/tasks/v2beta2/Queue.java