private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.video.stitcher.v1.CdnKey,
            com.google.cloud.video.stitcher.v1.CdnKey.Builder,
            com.google.cloud.video.stitcher.v1.CdnKeyOrBuilder>
        getCdnKeyFieldBuilder() {
      if (cdnKeyBuilder_ == null) {
        cdnKeyBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.video.stitcher.v1.CdnKey,
                com.google.cloud.video.stitcher.v1.CdnKey.Builder,
                com.google.cloud.video.stitcher.v1.CdnKeyOrBuilder>(
                getCdnKey(), getParentForChildren(), isClean());
        cdnKey_ = null;
      }
      return cdnKeyBuilder_;
    }
<pre>
Required. The CDN key resource which replaces the resource on the server.
</pre>

<code>
.google.cloud.video.stitcher.v1.CdnKey cdn_key = 1 [(.google.api.field_behavior) = REQUIRED];
</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/UpdateCdnKeyRequest.java