public Builder clearStreamId() {
        streamId_ = getDefaultInstance().getStreamId();
        bitField0_ = (bitField0_ & ~0x00000002);
        onChanged();
        return this;
      }
<pre>
Required. The stream ID generated by Ad Manager.
</pre>

<code>string stream_id = 2 [(.google.api.field_behavior) = REQUIRED];</code>

@return This builder for chaining.
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/VodSession.java