我已经project_id在meilisearch中添加了索引https://github.com/meilisearch/meilisearch，但过了一段时间，meilisearchproject_id会自动消失，并且搜索会显示错误：
2023-12-04T12:08:57.480187894+00:00 ERROR texhub_server::service::project::project_service - search failed,Meilisearch invalid_request: invalid_search_filter: Attribute `project_id` is not filterable. Available filterable attributes are: `name`.
1:11 project_id = 287ea73d1c78463298e9e5b267cab87f. https://docs.meilisearch.com/errors#invalid_search_filter, params: SearchProjParams { project_id: "287ea73d1c78463298e9e5b267cab87f", keyword: "address" }
索引什么时候消失的？我已经在 kubernetes pod 中指定了存储文件夹并绑定了 NFS。文件存在但索引消失了，如何处理？