Index update from index config

[rdettai]

Description

• Add the indexing settings to the update APIs
• use the index config as input to the update cli and endpoint
• docs

Note: I removed some ref to the deprecated max_merge_write_throughput here and there.

How was this PR tested?

Tested the example docs
Tested the swagger

[github-actions]

On SSD:

Average search latency is 1.0x that of the reference (lower is better).
Ref run id: 2041, ref commit: 82a00a7
Link

On GCS:

Average search latency is 1.14x that of the reference (lower is better).
Ref run id: 2042, ref commit: 82a00a7
Link

[rdettai]

Regarding the following TODO:

quickwit/quickwit/quickwit-control-plane/src/control_plane.rs

Line 585 in 63f198b

// TODO: Handle doc mapping and/or indexing settings update here.

My current understanding is that it should be addressed after #4928.

[guilload]

In good shape.