BUG: Missing isset key check before setting variable against value

[tropicandid]

Describe the bug

Within the elasticpress plugin for Wordpress, in the file /includes/classes/Feature/Facets/FacetType.php on line 114, there is no check to see if the array key for $block['attrs']['facet'] is set before attempting to set the $acc[] variable record to it. This throws an 'Undefined array key' warning in certain cases.

Recommendation to wrap code like so

if( isset( $block['attrs']['facet'] ) ) { $acc[] = $block['attrs']['facet']; }

Steps to Reproduce

1. Install the plugin and activate
2. Add a filter by taxonomy block or any other filter block to a page and load it.
3. Warnings about the missing key will appear depending on your logging settings.

Screenshots, screen recording, code snippet

Environment information

No response

WordPress and ElasticPress information

No response

Code of Conduct

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