final GetSettingsResponse response =
                client.admin().indices().prepareGetSettings().setIndices(analyzerSettingsIndexName).execute().actionGet();
        final Settings settings = response.getIndexToSettings().get(analyzerSettingsIndexName);
        final Settings analyzerSettings = settings.getAsSettings("index.analysis.analyzer");
        return analyzerSettings.getAsGroups().keySet();
    }

    /**