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 );