private function getIndexSettings($synonyms, $expansions)
{
$settings = ['number_of_shards' => $this->indexSettingsHelper->getNumberOfShards(), 'number_of_replicas' => $this->indexSettingsHelper->getNumberOfReplicas(), 'requests.cache.enable' => true];
$settings['analysis']['filter']['shingle'] = ['type' => 'shingle', 'output_false' => true, 'token_separator' => ThesaurusIndex::WORD_DELIMITER];
$settings = $this->addAnalyzerSettings($settings, 'synonym', $synonyms);
$settings = $this->addAnalyzerSettings($settings, 'expansion', $expansions);
return $settings;
}