Terms: Adjust fuzziness for admin term search queries

[rebeccahum]

Description of the Change

This fixes a bug when searching in the admin for post tags and the results are unexpected. To reproduce:

1. Enable feature terms wp elasticpress activate-feature terms
2. Run wp elasticpress index --setup
3. Create three post tags:

• Test Post
• Test Ruth
• The Most Fun Thing

4. Search for "the most fun thing" and you will see that all terms are being returned

It doesn't make sense to have fuzzy search enabled for terms in the back-end, especially since users are most likely to be searching for a specific word in the tags..

Alternate Designs

We could change the default to be 0 instead of 1 but I'm not sure how far reaching that would be for non-admin term queries:

ElasticPress/includes/classes/Indexable/Term/Term.php

Line 387 in a1c02b2

'fuzziness' => apply_filters( 'ep_term_fuzziness_arg', 1, $prepared_search_fields, $query_vars ),

Benefits

Results will be more accurate when searching for a tag with a term in it.

Possible Drawbacks

For users who appreciate the fuzziness, they may be wondering why it is no longer there.

Verification Process

1. Follow reproduction steps in "Description of the Change"
2. Check out PR
3. Do search again from step 4 and see just the one result: "The most fun thing"

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Changelog Entry

Changed: Terms search query in admin will not be fuzzy

[rebeccahum]

Thanks for looking @felipeelia. Version tag has been changed.