Custom Document Name Handler

[russellweiss]

Description
For existing collections where document names cannot be easily modified, the Meilisearch extension fails because certain characters are not allowed.

It would be good to enable an option to either automatically sanitize this document name or use a GUID for each document.

Unfortunately, this issue is preventing me from using the Meilisearch extension.

Basic example
Document names contain the "\" character. We'd be fine replacing them with "_" or "-" or another allowed character.

Other
The ability to write and specify a custom handler or function would be helpful as well.

[VikramNagwal]

Is it okay to replace all the invalid characters with valid ones?