[Bug] backup error of 1.5.0 version

### Bug Type (问题类型)

None

### Before submit

- [x] I had searched in the [issues](https://github.com/apache/hugegraph-toolchain/issues) and found no similar issues.

### Environment (环境信息)

- Server Version: v1.5.0
- Toolchain Version: v1.5.0
- Data Size: xx vertices, xx edges

### Expected & Actual behavior (期望与实际表现)

server version:1.5.0
client version:1.5.0

when using backup, you can get the error that is "Failed to execute Unrecognized field "edgelabel_type" (class org.apache.hugegraph.structure.schema.EdgeLabel), not marked as ignorable (15 known properties: "check_exist", "target_label", "name", "index_labels", "source_label", "status", "properties", "sort_keys", "id", "frequency", "ttl_start_time", "user_data", "enable_label_index", "ttl", "nullable_keys"])"

The sentence of backup is
"${HUGEGRAPH_TOOL_BIN}" --url "${GRAPH_URL}" --graph "${GRAPH_NAME}" \
backup -t "vertex,vertex_label,edge_label,property_key,index_label" --compress false \
--directory "${LOCAL_BACKUP_DIR}" -l "${LOG_FILE}"
"

who can help me!!!

### Vertex/Edge example (问题点 / 边数据举例)

```javascript

```

### Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)

```javascript

```

Start with the backup entry point using the shown command and reproduce the failure against server and client version 1.5.0. Trace how the EdgeLabel schema is serialized and read around the unrecognized "edgelabel_type" field. Done means the backup completes without this deserialization error.

Written by the indexing model from the issue text.