Document `_vectors.embedder_name`

[guimachiavelli]

According to a Slack discussion (private link), users may instruct Meilisearch not to generate embeddings for a document by including the following field:

{
…
  "_vectors" : {
    "embedder_name": null
  }
}

We could one or both of two things:

1. Create a very short guide "Exclude specific documents from an embedder"
2. Create a reference for documents, exhaustively describing not only _vectors, but other reserved fields such as _geo

References

• Slack discussion (private link)
• SME: @dureuill

[dureuill]

Hello

I think both things are probably good to do.

(1) is use case oriented, (2) is more like a reference