Feat update documents by function

[Ja7ad]

Pull Request

Related issue

Fixes #574

What does this PR do?

• Add update documents by function

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

[codecov]

Codecov Report

Attention: Patch coverage is 82.35294% with 3 lines in your changes missing coverage. Please review.

Project coverage is 86.21%. Comparing base (0bf60fa) to head (421d917).

Files with missing lines	Patch %	Lines
index_document.go	82.35%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #590      +/-   ##
==========================================
- Coverage   86.23%   86.21%   -0.03%     
==========================================
  Files          14       14              
  Lines        2826     2843      +17     
==========================================
+ Hits         2437     2451      +14     
- Misses        280      282       +2     
- Partials      109      110       +1     

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