/**
* @param $study
* @return the seven most similar studies based on subjects
*/
public static function thematicallySimilarQuery($resource)
{
$json = '{
"query": {
"bool": {
"must_not": {
"match": {
"_id": "' . $resource['_id'] . '"
}
},
"should": [';
$firstMatch = true;
if (array_key_exists('nativeSubject', $resource['_source'])) {
foreach ($resource['_source']['keyword']['en'] as $subject) {
if ($firstMatch) {
$firstMatch = false;
} else {
$json .= ',';
}
$json .= '{
"match": {
"keyword.en": "' . $subject . '"
}
}';
}
}
$json .= '],
"minimum_should_match" : 1
}
}
}';
$params = ['index' => 'study', 'type' => 'studytype', 'size' => 7, 'body' => $json];
$result = ElasticSearch::getClient()->search($params);
return $result['hits']['hits'];
}
