Search backend refactor with typesense impl (#5528)

* initial elasticsearch impl

* working elastic cluster

* replace SearchError with ApiError for preparation of search backend

* start factoring meili out to trait

* move meili to backend

* update routes to use search backend trait

* wip

* Update projects.rs

* search backend is only init'd once in config

* wip

* wip: backend agnostic

* change search internal routes to delegate to backend

* initial elasticsearch impl

* fix filtering

* elastic impl

* refactor indexing into its own module

* clean up elastic code

* fix ci

* fix tests

* fix elastic health check

* fix up env rebase

* fix compile

* dummy commit to update github pr

* Fix rebase

* Elastic basic https auth

* Fix duplicate projects showing up

* Fix up tests

* Replace search `ApiErrors` with `eyre::Reports`, propagate background task errors

* clean up agents files

* make index chunk size configurable

* make `match_phrase` in elastic case-insensitive

* use current/next indices and swap between them

* test case for error body

* Fix failing case

* da merge

* factor out common stuff from search backends

* allow fetching hit metadata from search results

* allow customising elasticsearch search config

* bit of docs

* add mappings to indices for elastic

* Implement Typesense

* wip

* fix up some sort fields stuff

* use different approach to filterable field sets

* remove a bunch of search fields which weren't used for filtering

* bucket text matches

* Bucketing by text_match for typesense

* fix tombi lint

* fix some sentry errors and dont prioritise 2+ term matches

* tweak ts query settings

* expose some more search settings

* query sort changes

* small fixes

* should fix pagination stuff

* fix healthcheck maybe

* ragebait ci

* tests

* tests

* revert environment

Cargo.lock

@@ -2714,6 +2714,29 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "elasticsearch"
+version = "9.1.0-alpha.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12bb303aa6e1d28c0c86b6fbfe484fd0fd3f512629aeed1ac4f6b85f81d9834a"
+dependencies = [
+ "base64 0.22.1",
+ "bytes",
+ "dyn-clone",
+ "flate2",
+ "lazy_static",
+ "parking_lot",
+ "percent-encoding",
+ "reqwest 0.12.24",
+ "rustc_version",
+ "serde",
+ "serde_json",
+ "serde_with",
+ "tokio",
+ "url",
+ "void",
+]
+
 [[package]]
 name = "elliptic-curve"
 version = "0.13.8"
@@ -4895,6 +4918,7 @@ dependencies = [
  "dotenv-build",
  "dotenvy",
  "either",
+ "elasticsearch",
  "eyre",
  "futures",
  "futures-util",