Error happened in Index building

[IANTHEREAL]

the error stack:

Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 1144, in _commit_impl
    self.engine.dialect.do_commit(self.connection)
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/default.py", line 701, in do_commit
    dbapi_connection.commit()
  File "/usr/local/lib/python3.11/site-packages/pymysql/connections.py", line 483, in commit
    self._read_ok_packet()
  File "/usr/local/lib/python3.11/site-packages/pymysql/connections.py", line 453, in _read_ok_packet
    pkt = self._read_packet()
          ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pymysql/connections.py", line 775, in _read_packet
    packet.raise_for_error()
  File "/usr/local/lib/python3.11/site-packages/pymysql/protocol.py", line 219, in raise_for_error
    err.raise_mysql_exception(self._data)
  File "/usr/local/lib/python3.11/site-packages/pymysql/err.py", line 150, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.OperationalError: (1105, 'tikv aborts txn: Error(KeyTooLarge { size: 9342, limit: 8192 })')

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/app/app/tasks/build_index.py", line 60, in build_index_for_document
    index_service.build_vector_index_for_document(index_session, db_document)
  File "/app/app/rag/build_index.py", line 72, in build_vector_index_for_document
    vector_index.insert(document, source_uri=db_document.source_uri)
  File "/usr/local/lib/python3.11/site-packages/llama_index/core/indices/base.py", line 215, in insert
    self.insert_nodes(nodes, **insert_kwargs)
  File "/usr/local/lib/python3.11/site-packages/llama_index/core/indices/vector_store/base.py", line 330, in insert_nodes
    self._insert(nodes, **insert_kwargs)
  File "/usr/local/lib/python3.11/site-packages/llama_index/core/indices/vector_store/base.py", line 311, in _insert
    self._add_nodes_to_index(self._index_struct, nodes, **insert_kwargs)
  File "/usr/local/lib/python3.11/site-packages/llama_index/core/indices/vector_store/base.py", line 232, in _add_nodes_to_index
    new_ids = self._vector_store.add(nodes_batch, **insert_kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/app/rag/vector_store/tidb_vector_store.py", line 135, in add
    self._session.commit()
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/orm/session.py", line 2017, in commit
    trans.commit(_to_root=True)
  File "<string>", line 2, in commit
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/orm/state_changes.py", line 139, in _go
    ret_value = fn(self, *arg, **kw)
                ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/orm/session.py", line 1309, in commit
    trans.commit()
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 2629, in commit
    self._do_commit()
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 2734, in _do_commit
    self._connection_commit_impl()
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 2705, in _connection_commit_impl
    self.connection._commit_impl()
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 1146, in _commit_impl
    self._handle_dbapi_exception(e, None, None, None, None)
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 2353, in _handle_dbapi_exception
    raise sqlalchemy_exception.with_traceback(exc_info[2]) from e
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/base.py", line 1144, in _commit_impl
    self.engine.dialect.do_commit(self.connection)
  File "/usr/local/lib/python3.11/site-packages/sqlalchemy/engine/default.py", line 701, in do_commit
    dbapi_connection.commit()
  File "/usr/local/lib/python3.11/site-packages/pymysql/connections.py", line 483, in commit
    self._read_ok_packet()
  File "/usr/local/lib/python3.11/site-packages/pymysql/connections.py", line 453, in _read_ok_packet
    pkt = self._read_packet()
          ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/pymysql/connections.py", line 775, in _read_packet
    packet.raise_for_error()
  File "/usr/local/lib/python3.11/site-packages/pymysql/protocol.py", line 219, in raise_for_error
    err.raise_mysql_exception(self._data)
  File "/usr/local/lib/python3.11/site-packages/pymysql/err.py", line 150, in raise_mysql_exception
    raise errorclass(errno, errval)
sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (1105, 'tikv aborts txn: Error(KeyTooLarge { size: 9342, limit: 8192 })')
(Background on this error at: https://sqlalche.me/e/20/e3q8)