public final Builder mergeUnknownFields(final com.google.protobuf.UnknownFieldSet unknownFields) {
                return super.mergeUnknownFields(unknownFields);
            }
<code>optional .jraft.ErrorResponse errorResponse = 99;</code>
jraft-core/src/main/java/com/alipay/sofa/jraft/rpc/RpcRequests.java