Prevent specific Category from being indexed with posts in SearchWP

searchwp-customizations.php

<?php

// Prevent specific Category from being indexed with posts in SearchWP.
add_filter( 
  'searchwp\source\post\attributes\taxonomy\terms', 
  function( $terms, $args ) {
    // Do not index the 'Uncategorized' term.
    return array_filter( $terms, function( $term ) {
      return 'Uncategorized' !== $term->name;
    } );
  }, 
  20, 2 
);