MeiliSearch: Advanced Search issues

Hey team,

having MeiliSearch activated, the advanced search isn't entirely supported:


using `is:question` or `is:answer` doesn't has results anymore:

same with the other options (user:, answers:, score:).

Tags in searches `[mytag]` seems to be ignored, as the result contains any tags, and isn't different to a search without [tag]s.

MeiliSearch log doesn't show any errors (search requests respond with http 200), please shout out, if I shall test something or which details to provide.

Thx!

首先启用 MeiliSearch，并使用 `is:question`、`is:answer`、`user:`、`answers:`、`score:` 和 `[tag]` 重现搜索。将这些结果与不使用过滤器的搜索结果进行比较，并检查 MeiliSearch 请求和日志；当每个高级选项都能正确过滤结果且不产生错误时，即表示完成。

由索引模型根据 Issue 内容生成。