public Builder clearDocumentInputConfig() {
      bitField0_ = (bitField0_ & ~0x00000008);
      documentInputConfig_ = null;
      if (documentInputConfigBuilder_ != null) {
        documentInputConfigBuilder_.dispose();
        documentInputConfigBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Required. Input configurations.
</pre>

<code>
.google.cloud.translation.v3.DocumentInputConfig document_input_config = 4 [(.google.api.field_behavior) = REQUIRED];
</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/TranslateDocumentRequest.java