Suggest

Objective suggest builder in ONGR ElasticsearchDSL represents Elasticsearch suggesters. The Suggest class is universal for all the suggesters that are currently implemented in Elasticsearch.

The Suggest object takes up to 5 parameters during the initiation:

Parameter	Description
`name`	The name of the Suggest
`field`	The ES field to execute the suggest
`type`	The type of the suggest (eg. phrase)
`text`	The text that will be passed to suggest
`parameters`	Array of additional parameters that may be unique to every type of suggest

To form a suggest you have to create Search object. See examples below for more information on suggest usage:

Simple example

$search = new Search();
$suggest = new Suggest('my_suggest', 'term', 'searchText', 'title', ['size' => 5]);
$search->addSuggest($suggest);
$queryArray = $search->toArray();

That will generate following JSON:

"suggest": {
  "my_suggest": {
    "text": "searchText",
    "term": {
      "field": "title",
      "size": 5
    }
  }
}

Example of multiple suggests

You're able to create more than one suggest:

$search = new Search();
$suggest1 = new Suggest('my_suggest1', 'term', 'the amsterdma meetpu', 'body', ['size' => 5]);
$search->addSuggest($suggest1);
$suggest2 = new Suggest('my_suggest2', 'term', 'the rottredam meetpu', 'title', ['size' => 5]);
$search->addSuggest($suggest2);
$queryArray = $search->toArray();

That will generate following JSON:

"suggest": {
  "my_suggest1": {
    "text": "the amsterdma meetpu",
    "term": {
      "field": "body",
      "size": 5
    }
  },
  "my_suggest2": {
    "text": "the rottredam meetpu",
    "term": {
      "field": "title",
      "size": 5
    }
  }
}

Example of phrase suggest

Also, provide different types of suggests, for example, this is a phrase suggest:

$search = new Search();
$suggest = new Suggest(
    'my-suggest',
    'phrase',
    'Xor the Got-Jewel',
    'bigram',
    [
        'analyzer' => 'body',
        'size' => 1,
        'real_word_error_likelihood' => 0.95,
        'max_errors' => 0.5,
        'gram_size' => 2,
        'direct_generator' => [
            [
                'field' => 'body',
                'suggest_mode' => 'always',
                'min_word_length' => 1
            ]
        ],
        'highlight'=> [
            'pre_tag' => '<em>',
            'post_tag' => '</em>'
        ]
    ]
);

$search->addSuggest($suggest);
$queryArray = $search->toArray();

That will generate following JSON:

"suggest" : {
  "my-suggest"
    "text" : "Xor the Got-Jewel",
    "phrase" : {
      "analyzer" : "body",
      "field" : "bigram",
      "size" : 1,
      "real_word_error_likelihood" : 0.95,
      "max_errors" : 0.5,
      "gram_size" : 2,
      "direct_generator" : [ {
        "field" : "body",
        "suggest_mode" : "always",
        "min_word_length" : 1
      } ],
      "highlight": {
        "pre_tag": "<em>",
        "post_tag": "</em>"
      }
    }
  }
}

Example of completion suggest:


$search = new Search();
$suggest = new Suggest('song-suggest', 'completion', 'n', 'suggest');

$search->addSuggest($suggest);
$queryArray = $search->toArray();

That will generate following JSON:


"suggest" : {
  "song-suggest" : {
    "text" : "n",
    "completion" : {
      "field" : "suggest"
    }
  }
}

Example of context suggest:


$search = new Search();
$suggest = new Suggest(
    'context-suggestion',
    'completion',
    'm',
    'suggest_field',
    [
        'context' => ['color' => 'red'],
        'size' => 10
    ]
);

$search->addSuggest($suggest);
$queryArray = $search->toArray();

That will generate following JSON:


"suggest" : {
  "context-suggestion" : {
    "text" : "m",
    "completion" : {
      "field" : "suggest_field",
      "size": 10,
      "context": {
        "color": "red"
      }
    }
  }
}

Find out more about suggesters in the official Elasticsearch suggest documentation