private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.visionai.v1.Channel,
            com.google.cloud.visionai.v1.Channel.Builder,
            com.google.cloud.visionai.v1.ChannelOrBuilder>
        getChannelFieldBuilder() {
      if (channelBuilder_ == null) {
        channelBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.visionai.v1.Channel,
                com.google.cloud.visionai.v1.Channel.Builder,
                com.google.cloud.visionai.v1.ChannelOrBuilder>(
                getChannel(), getParentForChildren(), isClean());
        channel_ = null;
      }
      return channelBuilder_;
    }
<pre>
Required. The resource being created.
</pre>

<code>
.google.cloud.visionai.v1.Channel channel = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/MaterializeChannelRequest.java