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 /latvian-index
{
"settings": {
"analysis": {
"filter": {
"latvian_stop": {
"type": "stop",
"stopwords": "_latvian_"
},
"latvian_stemmer": {
"type": "stemmer",
"language": "latvian"
},
"latvian_keywords": {
"type": "keyword_marker",
"keywords": []
}
},
"analyzer": {
"latvian_analyzer": {
"type": "custom",
"tokenizer": "standard",
"filter": [
"lowercase",
"latvian_stop",
"latvian_keywords",
"latvian_stemmer"
]
}
}
}
},
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "latvian_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
}
]
}