Cmr 9898 variable concept id instance format keyword search

[sxu123]

Overview

What is the feature/fix?

Make variable searchable through variable concept id and instance format using keyword search.

What is the Solution?

Indexed both fields in the keyword.

What areas of the application does this impact?

CMR and MMT search.

Checklist

• [ x] I have updated/added unit and integration tests that prove my fix is effective or that my feature works
• [ x] New and existing unit and int tests pass locally and remotely with my changes
• [ x] I have removed unnecessary/dead code and imports in files I have changed
• [x ] I have performed a self-review of my own code
• [ x] I have commented my code, particularly in hard-to-understand areas
• [x ] I have made corresponding changes to the documentation
• [ x] My changes generate no new warnings
• [ ] I have cleaned up integration tests by doing one or more of the following:
  • de-duped, consolidated, removed dead int tests
  • transformed applicable int tests into unit tests
  • refactored to reduce number of system state resets by updating fixtures (use-fixtures :each (ingest/reset-fixture {})) to be :once instead of :each

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 57.76%. Comparing base (c8c9da8) to head (e5389b9). Report is 1 commits behind head on master.

Files	Patch %	Lines
...xer-app/src/cmr/indexer/data/concepts/variable.clj	0.00%	6 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2125 +/- ## ========================================== - Coverage 57.77% 57.76% -0.02% ========================================== Files 1041 1041 Lines 70286 70289 +3 Branches 1991 1987 -4 ========================================== - Hits 40609 40602 -7 - Misses 27828 27835 +7 - Partials 1849 1852 +3 ```

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