Latvian analyzer
The built-in latvian analyzer can be applied to a text field using the following command:
PUT /latvian-index
{
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "latvian"
}
}
}
}
Stem exclusion
You can use stem_exclusion with this language analyzer using the following command:
PUT index_with_stem_exclusion_latvian_analyzer
{
"settings": {
"analysis": {
"analyzer": {
"stem_exclusion_latvian_analyzer": {
"type": "latvian",
"stem_exclusion": ["autoritāte", "apstiprinājums"]
}
}
}
}
}
Latvian analyzer internals
The latvian analyzer is built using the following components:
-
Tokenizer:
standard -
Token filters:
- lowercase
- stop (Latvian)
- keyword
- stemmer (Latvian)
Custom Latvian analyzer
You can create a custom Latvian analyzer using the following command:
PUT /italian-index
{
"settings": {
"analysis": {
"filter": {
"italian_stop": {
"type": "stop",
"stopwords": "_italian_"
},
"italian_elision": {
"type": "elision",
"articles": [
"c", "l", "all", "dall", "dell",
"nell", "sull", "coll", "pell",
"gl", "agl", "dagl", "degl", "negl",
"sugl", "un", "m", "t", "s", "v", "d"
],
"articles_case": true
},
"italian_stemmer": {
"type": "stemmer",
"language": "light_italian"
},
"italian_keywords": {
"type": "keyword_marker",
"keywords": []
}
},
"analyzer": {
"italian_analyzer": {
"type": "custom",
"tokenizer": "standard",
"filter": [
"italian_elision",
"lowercase",
"italian_stop",
"italian_keywords",
"italian_stemmer"
]
}
}
}
},
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "italian_analyzer"
}
}
}
}
Generated tokens
Use the following request to examine the tokens generated using the analyzer:
POST /latvian-index/_analyze
{
"field": "content",
"text": "Studenti mācās Latvijas universitātēs. Viņu numuri ir 123456."
}
The response contains the generated tokens:
{
"tokens": [
{"token": "student","start_offset": 0,"end_offset": 8,"type": "<ALPHANUM>","position": 0},
{"token": "māc","start_offset": 9,"end_offset": 14,"type": "<ALPHANUM>","position": 1},
{"token": "latvij","start_offset": 15,"end_offset": 23,"type": "<ALPHANUM>","position": 2},
{"token": "universitāt","start_offset": 24,"end_offset": 37,"type": "<ALPHANUM>","position": 3},
{"token": "vin","start_offset": 39,"end_offset": 43,"type": "<ALPHANUM>","position": 4},
{"token": "numur","start_offset": 44,"end_offset": 50,"type": "<ALPHANUM>","position": 5},
{"token": "123456","start_offset": 54,"end_offset": 60,"type": "<NUM>","position": 7}
]
}