Bulgarian analyzer
The built-in bulgarian analyzer can be applied to a text field using the following command:
PUT /bulgarian-index
{
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "bulgarian"
}
}
}
}
Stem exclusion
You can use stem_exclusion with this language analyzer using the following command:
PUT index_with_stem_exclusion_bulgarian_analyzer
{
"settings": {
"analysis": {
"analyzer": {
"stem_exclusion_bulgarian_analyzer": {
"type": "bulgarian",
"stem_exclusion": ["авторитет", "одобрение"]
}
}
}
}
}
Bulgarian analyzer internals
The bulgarian analyzer is built using the following components:
-
Tokenizer:
standard -
Token filters:
- lowercase
- stop (Bulgarian)
- keyword
- stemmer (Bulgarian)
Custom Bulgarian analyzer
You can create a custom Bulgarian analyzer using the following command:
PUT /bulgarian-index
{
"settings": {
"analysis": {
"filter": {
"bulgarian_stop": {
"type": "stop",
"stopwords": "_bulgarian_"
},
"bulgarian_stemmer": {
"type": "stemmer",
"language": "bulgarian"
},
"bulgarian_keywords": {
"type": "keyword_marker",
"keywords": []
}
},
"analyzer": {
"bulgarian_analyzer": {
"type": "custom",
"tokenizer": "standard",
"filter": [
"lowercase",
"bulgarian_stop",
"bulgarian_keywords",
"bulgarian_stemmer"
]
}
}
}
},
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "bulgarian_analyzer"
}
}
}
}
Generated tokens
Use the following request to examine the tokens generated using the analyzer:
POST /bulgarian-index/_analyze
{
"field": "content",
"text": "Студентите учат в българските университети. Техните номера са 123456."
}
The response contains the generated tokens:
{
"tokens": [
{"token": "студент","start_offset": 0,"end_offset": 10,"type": "<ALPHANUM>","position": 0},
{"token": "учат","start_offset": 11,"end_offset": 15,"type": "<ALPHANUM>","position": 1},
{"token": "българск","start_offset": 18,"end_offset": 29,"type": "<ALPHANUM>","position": 3},
{"token": "университят","start_offset": 30,"end_offset": 42,"type": "<ALPHANUM>","position": 4},
{"token": "техн","start_offset": 44,"end_offset": 51,"type": "<ALPHANUM>","position": 5},
{"token": "номер","start_offset": 52,"end_offset": 58,"type": "<ALPHANUM>","position": 6},
{"token": "123456","start_offset": 62,"end_offset": 68,"type": "<NUM>","position": 8}
]
}