private com.google.protobuf.SingleFieldBuilderV3<
            com.google.rpc.LocalizedMessage,
            com.google.rpc.LocalizedMessage.Builder,
            com.google.rpc.LocalizedMessageOrBuilder>
        getActionItemFieldBuilder() {
      if (actionItemBuilder_ == null) {
        actionItemBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.rpc.LocalizedMessage,
                com.google.rpc.LocalizedMessage.Builder,
                com.google.rpc.LocalizedMessageOrBuilder>(
                getActionItem(), getParentForChildren(), isClean());
        actionItem_ = null;
      }
      return actionItemBuilder_;
    }
<pre>
Output only. Suggested action for solving the error.
</pre>

<code>
.google.rpc.LocalizedMessage action_item = 3 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>
java-vmmigration/proto-google-cloud-vmmigration-v1/src/main/java/com/google/cloud/vmmigration/v1/MigrationError.java