Remove non-Typesense search backends, add default env vars (#6082)

* Remove non-Typesense search backends, add default env vars

* shear

* remove some default keys

Cargo.lock

@@ -3059,29 +3059,6 @@ 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"
@@ -5275,7 +5252,6 @@ dependencies = [
  "dotenv-build",
  "dotenvy",
  "either",
- "elasticsearch",
  "eyre",
  "futures",
  "futures-util",