Irish analyzer
The built-in irish analyzer can be applied to a text field using the following command:
PUT /irish-index
{
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "irish"
}
}
}
}
Stem exclusion
You can use stem_exclusion with this language analyzer using the following command:
PUT index_with_stem_exclusion_irish_analyzer
{
"settings": {
"analysis": {
"analyzer": {
"stem_exclusion_irish_analyzer": {
"type": "irish",
"stem_exclusion": ["údarás", "faomhadh"]
}
}
}
}
}
Irish analyzer internals
The irish analyzer is built using the following components:
-
Tokenizer:
standard -
Token filters:
- hyphenation (Irish)
- elision (Irish)
- lowercase (Irish)
- stop (Irish)
- keyword
- stemmer (Irish)
Custom Irish analyzer
You can create a custom Irish analyzer using the following command:
PUT /irish-index
{
"settings": {
"analysis": {
"filter": {
"irish_stop": {
"type": "stop",
"stopwords": "_irish_"
},
"irish_elision": {
"type": "elision",
"articles": [ "d", "m", "b" ],
"articles_case": true
},
"irish_hyphenation": {
"type": "stop",
"stopwords": [ "h", "n", "t" ],
"ignore_case": true
},
"irish_lowercase": {
"type": "lowercase",
"language": "irish"
},
"irish_stemmer": {
"type": "stemmer",
"language": "irish"
},
"irish_keywords": {
"type": "keyword_marker",
"keywords": []
}
},
"analyzer": {
"irish_analyzer": {
"type": "custom",
"tokenizer": "standard",
"filter": [
"irish_hyphenation",
"irish_elision",
"irish_lowercase",
"irish_stop",
"irish_keywords",
"irish_stemmer"
]
}
}
}
},
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "irish_analyzer"
}
}
}
}
Generated tokens
Use the following request to examine the tokens generated using the analyzer:
POST /irish-index/_analyze
{
"field": "content",
"text": "Tá mic léinn ag staidéar in ollscoileanna na hÉireann. Is iad a gcuid uimhreacha ná 123456."
}
The response contains the generated tokens:
{
"tokens": [
{"token": "tá","start_offset": 0,"end_offset": 2,"type": "<ALPHANUM>","position": 0},
{"token": "mic","start_offset": 3,"end_offset": 6,"type": "<ALPHANUM>","position": 1},
{"token": "léinn","start_offset": 7,"end_offset": 12,"type": "<ALPHANUM>","position": 2},
{"token": "staidéar","start_offset": 16,"end_offset": 24,"type": "<ALPHANUM>","position": 4},
{"token": "ollscoileanna","start_offset": 28,"end_offset": 41,"type": "<ALPHANUM>","position": 6},
{"token": "héireann","start_offset": 45,"end_offset": 53,"type": "<ALPHANUM>","position": 8},
{"token": "cuid","start_offset": 64,"end_offset": 69,"type": "<ALPHANUM>","position": 12},
{"token": "uimhreacha","start_offset": 70,"end_offset": 80,"type": "<ALPHANUM>","position": 13},
{"token": "123456","start_offset": 84,"end_offset": 90,"type": "<NUM>","position": 15}
]
}