public Builder clearInput() {
      input_ = getDefaultInstance().getInput();
      bitField0_ = (bitField0_ & ~0x00000002);
      onChanged();
      return this;
    }
<pre>
The resource name of an existing input, in the form of:
`projects/{project}/locations/{location}/inputs/{inputId}`.
</pre>

<code>string input = 2 [(.google.api.resource_reference) = { ... }</code>

@return This builder for chaining.
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/InputAttachment.java