I think need to index first custom field. For indexing can use Search api mod...

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I think need to index first custom field. For indexing can use Search api module.

function mymodule_search_api_query_alter(\Drupal\search_api\Query\QueryInterface &$query) { // Ensure field_myfield is being indexed $fields = $query->getIndex()->getFields(); if (isset($fields['field_myfield'])) { $query->addCondition('field_myfield', 'myvalue', '<>'); } }

Reference - https://drupal.stackexchange.com/questions/78464/how-to-alter-search-que...
https://stackoverflow.com/questions/41855229/drupal-8-altering-search-ap...

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