Advice on mapping/searching with lowercase

Elastic Stack Elasticsearch
1

Hi,

I'm trying to figure out the correct mapping for searching for exact values
but lowercased. I thought this would work:
....
"exact_lowercase": {
"filter": [
"lowercase"
],
"type": "custom",
"tokenizer": "keyword"
}
......

and the mapping of the field:
"TITLE": {
"fields": {
"exact_lowercase": {
"search_analyzer": "keyword",
"index_analyzer": "exact_lowercase",
"type": "string"
},
...some other mapping....
},
"type": "multi_field"
}

but when i do a termquery or query_string query i'm not getting any hits,
for example "steel wheels". The original value: "Steel Wheels". What am i
doing wrong. The idea for the searchstrategy is to first match on exact
lowercase strings, if nothing is found we do a partial match.

Thanks,
Maarten

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2

At index time, you are using your exact_lowercase analyzer. "Steel Wheels" is indexed as "steel wheels".

When searching for "steel wheels" it obviously does not match.

Why not using the same analyzer at search and index time?

--
David :wink:
Twitter : @dadoonet / @elasticsearchfr / @scrutmydocs

Le 20 janv. 2015 à 09:28, Maarten Roosendaal mroosendaal14@gmail.com a écrit :

Hi,

I'm trying to figure out the correct mapping for searching for exact values but lowercased. I thought this would work:
....
"exact_lowercase": {
"filter": [
"lowercase"
],
"type": "custom",
"tokenizer": "keyword"
}
......

and the mapping of the field:
"TITLE": {
"fields": {
"exact_lowercase": {
"search_analyzer": "keyword",
"index_analyzer": "exact_lowercase",
"type": "string"
},
...some other mapping....
},
"type": "multi_field"
}

but when i do a termquery or query_string query i'm not getting any hits, for example "steel wheels". The original value: "Steel Wheels". What am i doing wrong. The idea for the searchstrategy is to first match on exact lowercase strings, if nothing is found we do a partial match.

Thanks,
Maarten

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