highlight field missing from Elasticsearch results, PHP

Question

I am trying to add search function to my website, using Elasticsearch + Laravel

The package I use can be found here: https://github.com/cviebrock/laravel-elasticsearch

So far I am able to get everything work except highlight. Here is my PHP code:

            $params = [
            'index' => 'my_index',
            'type' => 'web_page',
            'body' => [
                'query' => [
                    'bool' => [
                        'must' => [
                            [
                                'match' => [ 'combined' => $keywords ]
                            ],
                            [
                                'match' => [ 'status' => 1 ],
                            ]
                        ]
                    ]
                ],
                'highlight' => [
                    'pre_tags'  => '<em>',
                    'post_tags' => '</em>',
                    'fields'    => [
                       'combined' => new \stdClass()
                    ]
                ],
            ]
        ];

        try {
            $results = Elasticsearch::search($params);
        } catch (Exception $e) {
            var_dump($e->getMessage());
        }

        dd($results);

The results I get is like the following:

array:4 [▼
  "took" => 250
  "timed_out" => false
  "_shards" => array:3 [▶]
  "hits" => array:3 [▼
  "total" => 2
  "max_score" => 0.8117509
  "hits" => array:2 [▼
      0 => array:5 [▶]
      1 => array:5 [▼
        "_index" => "my_index"
        "_type" => "web_page"
        "_id" => "wp_2"
        "_score" => 0.4709723
        "_source" => array:7 [▶]
      ]
    ]
  ]
]

As you may see, I am missing 'highlight' field which is supposed to come after "_source".

I did follow instructions described in the following page:

https://www.elastic.co/guide/en/elasticsearch/client/php-api/current/_dealing_with_json_arrays_and_objects_in_php.html

Checked several related questions here, but still cannot figure out what I did wrong.

I have same problem on elastic 2.3.5 and PHP client 2.2.1. All those answers about empty objects in PHP are not helpful. It must be something else. Highlight broke when upgraded Elastic from 1.6 to 2.3 — Konrad Podgórski
– Konrad Podgórski, Commented Oct 11, 2016 at 20:24
Try to set "store" => true in your mapping. This solved my problem. stackoverflow.com/questions/38417170/… — Zhiyong Li
– Zhiyong Li, Commented Oct 13, 2016 at 2:59
It was not the case for me, I shared my solution in answer. Wasted so many hours on this... — Konrad Podgórski
– Konrad Podgórski, Commented Oct 13, 2016 at 7:55

Konrad Podgórski · Accepted Answer · 2016-10-13 07:54:37Z

Here is solution to missing highlight in my case

All answers about adding store => true to mapping didn't help, including restarting elasticsearch etc. in the end I'm running highlight correctly without adding it at all.

Elastic Search 2.3.5 Elastic PHP library 2.x

In my case it was conflict between ['body']['query']['match']['_all'] and highlight on specific fields

$params['body']['highlight']['fields']['headline'] = (object) [];
$params['body']['highlight']['fields']['description'] = (object) [];

Started to work after adding

$params['body']['highlight']["require_field_match"] = false;

Sharing code snippet.

$params = [];
$params['index'] = $this->index;
$params['type'] = $this->type;

$perPage = 20;
$offset = $perPage * ($page - 1);

$params['size'] = $perPage;
$params['from'] = $offset;

$params['body']['query']['match']['_all'] = [
    'query' => $searchQuery->getValue(),
    'fuzziness' => 'AUTO'
];

$params['body']['filter']['bool']['must'] = [];
$params['body']['filter']['bool']['must'][] = [
    'term' => ['verified' => true]
];

$params['body']['highlight']['fields']['headline'] = (object) [];
$params['body']['highlight']['fields']['description'] = (object) [];
$params['body']['highlight']["require_field_match"] = false;

$response = $this->elasticClient->search($params);

I hope this help someone

Stefan Alexandru · Accepted Answer · 2016-08-16 15:18:45Z

0

Try

'highlight' => [                      
       'fields'    => [
             'combined' => (object) []
        ]
 ]

Check out this tread: https://github.com/elastic/elasticsearch-php/issues/281

answered Aug 16, 2016 at 15:18

Stefan Alexandru

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1 Comment

Zhiyong Li Over a year ago

Thanks for posting answer, but yours is essentially equal to "'combined' => new \stdClass()".

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