private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.translate.v3.AdaptiveMtDataset,
            com.google.cloud.translate.v3.AdaptiveMtDataset.Builder,
            com.google.cloud.translate.v3.AdaptiveMtDatasetOrBuilder>
        getAdaptiveMtDatasetFieldBuilder() {
      if (adaptiveMtDatasetBuilder_ == null) {
        adaptiveMtDatasetBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.translate.v3.AdaptiveMtDataset,
                com.google.cloud.translate.v3.AdaptiveMtDataset.Builder,
                com.google.cloud.translate.v3.AdaptiveMtDatasetOrBuilder>(
                getAdaptiveMtDataset(), getParentForChildren(), isClean());
        adaptiveMtDataset_ = null;
      }
      return adaptiveMtDatasetBuilder_;
    }
<pre>
Required. The AdaptiveMtDataset to be created.
</pre>

<code>
.google.cloud.translation.v3.AdaptiveMtDataset adaptive_mt_dataset = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/CreateAdaptiveMtDatasetRequest.java