[Search] Lunr search engine support (#5290)

* add lunr package

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* add search translator type and search engine interface

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* (wip) add support for lunr search engine

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* lunr search engine support

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* clean up todo comments

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* typing and cleanups

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* move lunr type package from dev deps to deps

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* check if documents exist to index

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* test fixup

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* changeset

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* move LunrSearchEngine.ts to /engines and add tests

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* update imports

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* update error message

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* add comment to index rotation

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* Update plugins/search-backend-node/src/types.ts

Signed-off-by: Fredrik Adelöw freben@gmail.com

Co-authored-by: Fredrik Adelöw <freben@gmail.com>
Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* Update plugins/search-backend-node/src/engines/LunrSearchEngine.ts

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

Co-authored-by: Fredrik Adelöw <freben@gmail.com>

* Update plugins/search-backend-node/src/engines/LunrSearchEngine.ts

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

Co-authored-by: Fredrik Adelöw <freben@gmail.com>

* fix imports

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* use type assertion to specify more specific ConcreteLunrQuery type

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* fix imports

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* consistent naming

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* change search engine to be parameter of constructor in indexBuilder

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* make engine required in router options and pass it through in createRouter used in standalone server

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* fix tests

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* delete import

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* add types to SearchQuery interface to make it possible to scope to specific index + test

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* clean up tests

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

* handle case when a filter is added on a field that does not exist on all documents + test

Signed-off-by: Emma Indal <emma.indahl@gmail.com>

Co-authored-by: Fredrik Adelöw <freben@gmail.com>

yarn.lock

@@ -6210,6 +6210,11 @@
   resolved "https://registry.npmjs.org/@types/lru-cache/-/lru-cache-5.1.0.tgz#57f228f2b80c046b4a1bd5cac031f81f207f4f03"
   integrity sha512-RaE0B+14ToE4l6UqdarKPnXwVDuigfFv+5j9Dze/Nqr23yyuqdNvzcZi3xB+3Agvi5R4EOgAksfv3lXX4vBt9w==
 
+"@types/lunr@^2.3.3":
+  version "2.3.3"
+  resolved "https://registry.npmjs.org/@types/lunr/-/lunr-2.3.3.tgz#ec985618fd2712c010f8edab4f1ae7784ad7c583"
+  integrity sha512-09sXZZVsB3Ib41U0fC+O1O+4UOZT1bl/e+/QubPxpqDWHNEchvx/DEb1KJMOwq6K3MTNzZFoNSzVdR++o1DVnw==
+
 "@types/luxon@^1.25.0":
   version "1.26.0"
   resolved "https://registry.npmjs.org/@types/luxon/-/luxon-1.26.0.tgz#8e783986370ad3bb9f885d93eb1a91caeecaed36"
@@ -17927,6 +17932,11 @@ lru-queue@^0.1.0:
   dependencies:
     es5-ext "~0.10.2"
 
+lunr@^2.3.9:
+  version "2.3.9"
+  resolved "https://registry.npmjs.org/lunr/-/lunr-2.3.9.tgz#18b123142832337dd6e964df1a5a7707b25d35e1"
+  integrity sha512-zTU3DaZaF3Rt9rhN3uBMGQD3dD2/vFQqnvZCDv4dl5iOzq2IZQqTxu90r4E5J+nP70J3ilqVCrbho2eWaeW8Ow==
+
 luxon@1.25.0, luxon@^1.25.0:
   version "1.25.0"
   resolved "https://registry.npmjs.org/luxon/-/luxon-1.25.0.tgz#d86219e90bc0102c0eb299d65b2f5e95efe1fe72"