Finnish analyzer
The built-in finnish analyzer can be applied to a text field using the following command:
PUT /finnish-index
{
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "finnish"
}
}
}
}
Stem exclusion
You can use stem_exclusion with this language analyzer using the following command:
PUT index_with_stem_exclusion_finnish_analyzer
{
"settings": {
"analysis": {
"analyzer": {
"stem_exclusion_finnish_analyzer": {
"type": "finnish",
"stem_exclusion": ["valta", "hyväksyntä"]
}
}
}
}
}
Finnish analyzer internals
The finnish analyzer is built using the following components:
-
Tokenizer:
standard -
Token filters:
- lowercase
- stop (Finnish)
- keyword
- stemmer (Finnish)
Custom Finnish analyzer
You can create a custom Finnish analyzer using the following command:
PUT /finnish-index
{
"settings": {
"analysis": {
"filter": {
"finnish_stop": {
"type": "stop",
"stopwords": "_finnish_"
},
"finnish_stemmer": {
"type": "stemmer",
"language": "finnish"
},
"finnish_keywords": {
"type": "keyword_marker",
"keywords": ["Helsinki", "Suomi"]
}
},
"analyzer": {
"finnish_analyzer": {
"type": "custom",
"tokenizer": "standard",
"filter": [
"lowercase",
"finnish_stop",
"finnish_keywords",
"finnish_stemmer"
]
}
}
}
},
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "finnish_analyzer"
}
}
}
}
Generated tokens
Use the following request to examine the tokens generated using the analyzer:
POST /finnish-index/_analyze
{
"field": "content",
"text": "Opiskelijat opiskelevat Helsingissä ja Suomen yliopistoissa. Heidän numeronsa ovat 123456."
}
The response contains the generated tokens:
{
"tokens": [
{"token": "opiskelij","start_offset": 0,"end_offset": 11,"type": "<ALPHANUM>","position": 0},
{"token": "opiskelev","start_offset": 12,"end_offset": 23,"type": "<ALPHANUM>","position": 1},
{"token": "helsing","start_offset": 24,"end_offset": 35,"type": "<ALPHANUM>","position": 2},
{"token": "suome","start_offset": 39,"end_offset": 45,"type": "<ALPHANUM>","position": 4},
{"token": "yliopisto","start_offset": 46,"end_offset": 59,"type": "<ALPHANUM>","position": 5},
{"token": "numero","start_offset": 68,"end_offset": 77,"type": "<ALPHANUM>","position": 7},
{"token": "123456","start_offset": 83,"end_offset": 89,"type": "<NUM>","position": 9}
]
}