Include indicator ID in searched terms. (#1528)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #1525
- [ ] Tests for the changes have been added (for bug fixes / features)
- [ ] (If applicable) Documentation has been added / updated (for bug
fixes / features)
- [x] CHANGES.rst has been updated (with summary of main changes)
- [x] Link to issue (:issue:`number`) and pull request (:pull:`number`)
has been added

### What kind of change does this PR introduce?

* In the RtD, indicator search now searches through the indicator IDs. 

### Does this PR introduce a breaking change?


### Other information:

CHANGES.rst

@@ -4,7 +4,7 @@ Changelog
 
 v0.47.0 (unreleased)
 --------------------
-Contributors to this version: Juliette Lavoie (:user:`juliettelavoie`), Pascal Bourgault (:user:`aulemahal`), Trevor James Smith (:user:`Zeitsperre`).
+Contributors to this version: Juliette Lavoie (:user:`juliettelavoie`), Pascal Bourgault (:user:`aulemahal`), Trevor James Smith (:user:`Zeitsperre`), David Huard (:user:`huard`).
 
 Announcements
 ^^^^^^^^^^^^^
@@ -14,6 +14,7 @@ Announcements
 New features and enhancements
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 * New functions ``xclim.ensembles.robustness_fractions`` and ``xclim.ensembles.robustness_categories``. The former will replace ``xclim.ensembles.change_significance`` which is now deprecated and will be removed in xclim 0.49 (:pull:`1514`).
+* Add indicator ID to searched terms in the indicator search documentation page (:issue:`1525`, :pull:`1528`).
 
 Bug fixes
 ^^^^^^^^^

docs/_static/indsearch.js

@@ -3,7 +3,7 @@ let indicators = [];
 
 /* MiniSearch object defining search mechanism */
 let miniSearch = new MiniSearch({
-  fields: ['title', 'abstract', 'variables', 'keywords'], // fields to index for full-text search
+  fields: ['title', 'abstract', 'variables', 'keywords', 'id'], // fields to index for full-text search
   storeFields: ['title', 'abstract', 'vars', 'realm', 'module', 'name', 'keywords'], // fields to return with search results
   searchOptions: {
     boost: {'title': 3, 'variables': 2},