i was invert many hours trying found the best way to create and autocomplete that support a multilanguaje seach of cities. (ES/EN), fuzzieness and get priority for exact match (show this at top of results) but i cant find a good way to make this task.
My current solution work very well in many cases, but when I to find for Roma the first option is "Iasi-East Romania, romania" and Roma italy is the thirty function (is an exact match)
Result Json:
[{"_index":"destinations","_type":"doc","_id":"_X80XWcBn2nzTu98N7_F","_score":75.50012,"_source":{"destination_name_en":"Iasi-East Romania","destination_name_es":"Iasi-East Romania","destination_name_pt":"Iasi-East Romania","country_code":"RO","country_name":"ROMANIA","destination_id":7953,"popularity":"0"}},{"_index":"destinations","_type":"doc","_id":"7380XWcBn2nzTu98OMZl","_score":73.116455,"_source":{"destination_name_en":"La Romana","destination_name_es":"La Romana","destination_name_pt":"La Romana","country_code":"DO","country_name":"DOMINICAN REPUBLIC","destination_id":2816,"popularity":"0"}},{"_index":"destinations","_type":"doc","_id":"1X80XWcBn2nzTu98OMZl","_score":71.4391,"_source":{"_index":"destinations","_type":"doc","_id":"8H80XWcBn2nzTu98OMZl","_score":52.018818,"_source":{"destination_name_en":"Rome","destination_name_es":"Roma","destination_name_pt":"Roma","country_code":"IT","country_name":"ITALY","destination_id":6338,"popularity":"0"}}]
Right now this is my best solution..
Mapping:
'settings' => [
'analysis' => [
'filter' => [
'autocomplete_filter' => [
"type"=> "edge_ngram",
"min_gram"=> 1,
"max_gram"=> 20,
]
],
'analyzer' => [
'autocomplete' => [
"type" => "custom",
'tokenizer' => "standard",
'filter' => ['lowercase', 'asciifolding', 'autocomplete_filter'],
]
],
],
],
'mappings' =>[
'doc' => [
"properties"=> [
"destination_name_en"=> [
"type"=> "text",
"analyzer"=> "autocomplete",
"search_analyzer"=> "standard",
],
"destination_name_es"=> [
"type"=> "text",
"analyzer"=> "autocomplete",
"search_analyzer"=> "standard",
],
"destination_name_pt"=> [
"type"=> "text",
"analyzer"=> "autocomplete",
"search_analyzer"=> "standard",
],
"popularity"=> [
"type"=> "integer",
]
]
]
]
Search:
'query' => [
"bool" => [
"should" => [
[
"multi_match"=>[
"query"=>$text,
"fields"=>[
"destination_name_*"
],
"type"=>"most_fields",
"boost" => 2
]
],
[
"multi_match"=>[
"query"=>$text,
"fields"=>[
"destination_name_*"
],
"fuzziness" => "1",
"prefix_length"=> 2
]
]
]
]
]
Also, i want add boost to specific destination using her popularity value.
I hope that someone can guide me with an example or direction of which way to go.
I would appreciate it very much
The probleme is that when you search roma, Iasi-East Romania the first result since it contains roma in all language. But roma is only matching for Rome in ES/PT/IT and not for EN.
So if you want to boost exact matching your need to index your city name in another field without autocompletion (for all language) and add a new clause in the should on those field.
example for the mapping :
"properties"=> [
"destination_name_en"=> [
"type"=> "text",
"analyzer"=> "autocomplete",
"search_analyzer"=> "standard",
"fields": => [
"exact" => [
"type"=> "text",
"analyzer"=> "standard", // you could use a more fancy analyzer here
]
]
],
....
and in the query :
'query' => [
"bool" => [
"should" => [
[
"multi_match"=>[
"query"=>$text,
"fields"=>[
"destination_name_*"
],
"type"=>"most_fields",
"boost" => 2
]
],
[
"multi_match"=>[
"query"=>$text,
"fields"=>[
"destination_name_*"
],
"fuzziness" => "1",
"prefix_length"=> 2
]
],
[
"multi_match"=>[
"query"=>$text,
"type"=>"most_fields"
"fields"=>[
"destination_name_*.exact"
],
"boost" => 2
]
]
]
]
]
Could you try something like that and keep us posted ?