How do I configure elastic search to use the icu_tokenizer? - elasticsearch

Question

I'm trying to search a text indexed by elasticsearch and the icu_tokenizer but can't get it working.
My testcase is to tokenize the sentence “Hello. I am from Bangkok”, in thai สวัสดี ผมมาจากกรุงเทพฯ, which should be tokenized to the five words สวัสดี, ผม, มา, จาก, กรุงเทพฯ. (Sample from Elasticsearch - The Definitive Guide)
Searching using any of the last four words fails for me. Searching using any of the space separated words สวัสดี or ผมมาจากกรุงเทพฯ works fine.
If I specify the icu_tokenizer on the command line, like
curl -XGET 'http://localhost:9200/icu/_analyze?tokenizer=icu_tokenizer' -d "สวัสดี ผมมาจากกรุงเทพฯ"
it tokenizes to five words.
My settings are:
curl http://localhost:9200/icu/_settings?pretty
{
"icu" : {
"settings" : {
"index" : {
"creation_date" : "1474010824865",
"analysis" : {
"analyzer" : {
"nfkc_cf_normalized" : [ "icu_normalizer" ],
"tokenizer" : "icu_tokenizer"
}
}
},
"number_of_shards" : "5",
"number_of_replicas" : "1",
"uuid" : "tALRehqIRA6FGPu8iptzww",
"version" : {
"created" : "2040099"
}
}
}
}
The index is populated with
curl -XPOST 'http://localhost:9200/icu/employee/' -d '
{
"first_name" : "John",
"last_name" : "Doe",
"about" : "สวัสดี ผมมาจากกรุงเทพฯ"
}'
Searching with
curl -XGET 'http://localhost:9200/_search' -d'
{
"query" : {
"match" : {
"about" : "กรุงเทพฯ"
}
}
}'
Returns nothing ("hits" : [ ]).
Performing the same search with one of สวัสดี or ผมมาจากกรุงเทพฯ works fine.
I guess I've misconfigured the index, how should it be done?

Answer 1

The missing part is:
"mappings": {
"employee" : {
"properties": {
"about":{
"type": "text",
"analyzer": "icu_analyzer"
}
}
}
}
In the mapping, the document field have to be specified the analyzer to be using.
[Index] : icu
[type] : employee
[field] : about
PUT /icu
{
"settings": {
"analysis": {
"analyzer": {
"icu_analyzer" : {
"char_filter": [
"icu_normalizer"
],
"tokenizer" : "icu_tokenizer"
}
}
}
},
"mappings": {
"employee" : {
"properties": {
"about":{
"type": "text",
"analyzer": "icu_analyzer"
}
}
}
}
}
test the custom analyzer using followings DSLJson
POST /icu/_analyze
{
"text": "สวัสดี ผมมาจากกรุงเทพฯ",
"analyzer": "icu_analyzer"
}
The result should be [สวัสดี, ผม, มา, จาก, กรุงเทพฯ]
My suggestion would be :
Kibana : Dev Tool could help you for effective query crafting