是否可以在elasticsearch中仅使用没有文本搜索的过滤器

Question

I am using ES for my Laravel app, and I need to do a search query that only contains filters and no "text search" but I am not sure on how to write it.

Must I use match_all eg:

$query = [
   'filtered' => [
   'query' => [
       'match_all' => []
    ],
      'filter'=> [
         'bool' => [
            'must' => [
               [ 'range' => [
                  'price' => [
                     'lte' => 9000
                  ]
               ]
               ],
            ],
         ]
      ],
   ],
];

Or like this:

$query = [
   'filtered' => [
      'filter'=> [
         'bool' => [
            'must' => [
               [ 'range' => [
                  'price' => [
                     'lte' => 9000
                  ]
               ]
               ],
            ],
         ]
      ],
   ],
];

What I want is to only use a filtered bool query without text search.

Answer 1

In fact, if you don't specify the query part in your filtered query, a match_all query is used by default. Quoting the doc :

If a query is not specified, it defaults to the match_all query. This means that the filtered query can be used to wrap just a filter, so that it can be used wherever a query is expected.

Your second query should do the job : filters must be wrapped either in filtered (doc) or constant_score (doc) queries to be used.

If the scoring part isn't useful for you, you can stick to the filtered query.

Last thing : you don't have to nest your filter in a bool filter, unless you want to combine it with other(s) filter(s). In your demo case, you can write directly :

$query = [
   'filtered' => [
      'filter'=> [
         'range' => [
             'price' => [
                'lte' => 9000
             ]
          ]
      ]
   ]
];

Hope this will be helpful :)