public informationList: any = {
        'nested': {
            title: 'nested',
            content: `<span class="description">Nested query allows you to run a query against the nested documents and filter parent docs by those that have at least one nested document matching the query.</span>
                <a class="link" href="https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-nested-query.html#query-dsl-nested-query">Read more</a>`