Preserve special chars like # or @ for searching

[DavertMik]

If we use hashtags or user names inside documents (think of tweets), we need to ensure that # or @ char is taken into account.
However, Meilisearch treats # or @ as a blank character. So #special is the same as special.
Can we configure the list of empty characters for indexing, so @ or # won't be ignored?
This applies very well to the idea of prefix-based search, so I hope it is possible to implement.

[gmourier]

Hi @DavertMik 👋

Indeed, this is not possible yet. This is related to the tokenizer separators. We have a more detailed discussion here for this subject.

I'm locking this discussion to favor #160.

Thank you!