Merge branch '293724_search_filter_default_term' into 'master'

Document default search keyword when using filters

See merge request gitlab-org/gitlab!50205

doc/user/search/advanced_search_syntax.md

@@ -52,14 +52,17 @@ The Advanced Search Syntax also supports the use of filters. The available filte
 - blob: Filters by Git `object ID`. Exact match only.
 
 To use them, add them to your keyword in the format `<filter_name>:<value>` without
-any spaces between the colon (`:`) and the value. A keyword or an asterisk (`*`) is required for filter searches and has to be added in front of the filter separated by a space.
+any spaces between the colon (`:`) and the value. When no keyword is provided, an asterisk (`*`) will be used as the keyword.
 
 Examples:
 
 - Finding a file with any content named `search_results.rb`: [`* filename:search_results.rb`](https://gitlab.com/search?utf8=%E2%9C%93&snippets=&scope=blobs&repository_ref=&search=*+filename%3Asearch_results.rb&group_id=9970&project_id=278964)
-- Finding a file named `found_blob_spec.rb` with the text `CHANGELOG` inside of it: [`CHANGELOG filename:found_blob_spec.rb](https://gitlab.com/search?utf8=%E2%9C%93&snippets=&scope=blobs&repository_ref=&search=CHANGELOG+filename%3Afound_blob_spec.rb&group_id=9970&project_id=278964)
+- The leading asterisk (`*`) can be ignored in the case above: [`filename:search_results.rb`](https://gitlab.com/search?group_id=9970&project_id=278964&scope=blobs&search=filename%3Asearch_results.rb)
+- Finding a file named `found_blob_spec.rb` with the text `CHANGELOG` inside of it: [`CHANGELOG filename:found_blob_spec.rb`](https://gitlab.com/search?utf8=%E2%9C%93&snippets=&scope=blobs&repository_ref=&search=CHANGELOG+filename%3Afound_blob_spec.rb&group_id=9970&project_id=278964)
 - Finding the text `EpicLinks` inside files with the `.rb` extension: [`EpicLinks extension:rb`](https://gitlab.com/search?utf8=%E2%9C%93&snippets=&scope=blobs&repository_ref=&search=EpicLinks+extension%3Arb&group_id=9970&project_id=278964)
+- Finding any file with the `.yaml` extension: [`extension:yaml`](https://gitlab.com/search?utf8=%E2%9C%93&snippets=&scope=blobs&repository_ref=&search=extension%3Ayaml&group_id=9970&project_id=278964)
 - Finding the text `Sidekiq` in a file, when that file is in a path that includes `elastic`: [`Sidekiq path:elastic`](https://gitlab.com/search?utf8=%E2%9C%93&snippets=&scope=blobs&repository_ref=&search=Sidekiq+path%3Aelastic&group_id=9970&project_id=278964)
+- Finding any file in a path that includes `elasticsearch`: [`path:elasticsearch`](https://gitlab.com/search?utf8=%E2%9C%93&snippets=&scope=blobs&repository_ref=&search=path%3Aelasticsearch&group_id=9970&project_id=278964)
 - Finding the files represented by the Git object ID `998707b421c89bd9a3063333f9f728ef3e43d101`: [`* blob:998707b421c89bd9a3063333f9f728ef3e43d101`](https://gitlab.com/search?utf8=%E2%9C%93&snippets=false&scope=blobs&repository_ref=&search=*+blob%3A998707b421c89bd9a3063333f9f728ef3e43d101&group_id=9970)
 - Syntax filters can be combined for complex filtering. Finding any file starting with `search` containing `eventHub` and with the `.js` extension: [`eventHub filename:search* extension:js`](https://gitlab.com/search?utf8=%E2%9C%93&snippets=&scope=blobs&repository_ref=&search=eventHub+filename%3Asearch*+extension%3Ajs&group_id=9970&project_id=278964)