private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.translate.v3.DatasetInputConfig,
            com.google.cloud.translate.v3.DatasetInputConfig.Builder,
            com.google.cloud.translate.v3.DatasetInputConfigOrBuilder>
        getInputConfigFieldBuilder() {
      if (inputConfigBuilder_ == null) {
        inputConfigBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.translate.v3.DatasetInputConfig,
                com.google.cloud.translate.v3.DatasetInputConfig.Builder,
                com.google.cloud.translate.v3.DatasetInputConfigOrBuilder>(
                getInputConfig(), getParentForChildren(), isClean());
        inputConfig_ = null;
      }
      return inputConfigBuilder_;
    }
<pre>
Required. The config for the input content.
</pre>

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