Dutch analyzer
The built-in dutch analyzer can be applied to a text field using the following command:
PUT /dutch-index
{
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "dutch"
}
}
}
}
Stem exclusion
You can use stem_exclusion with this language analyzer using the following command:
PUT index_with_stem_exclusion_dutch_analyzer
{
"settings": {
"analysis": {
"analyzer": {
"stem_exclusion_dutch_analyzer": {
"type": "dutch",
"stem_exclusion": ["autoriteit", "goedkeuring"]
}
}
}
}
}
Dutch analyzer internals
The dutch analyzer is built using the following components:
-
Tokenizer:
standard -
Token filters:
- lowercase
- stop (Dutch)
- keyword
- stemmer_override
- stemmer (Dutch)
Custom Dutch analyzer
You can create a custom Dutch analyzer using the following command:
PUT /dutch-index
{
"settings": {
"analysis": {
"filter": {
"dutch_stop": {
"type": "stop",
"stopwords": "_dutch_"
},
"dutch_stemmer": {
"type": "stemmer",
"language": "dutch"
},
"dutch_keywords": {
"type": "keyword_marker",
"keywords": []
},
"dutch_override": {
"type": "stemmer_override",
"rules": [
"fiets=>fiets",
"bromfiets=>bromfiets",
"ei=>eier",
"kind=>kinder"
]
}
},
"analyzer": {
"dutch_analyzer": {
"type": "custom",
"tokenizer": "standard",
"filter": [
"lowercase",
"dutch_stop",
"dutch_keywords",
"dutch_override",
"dutch_stemmer"
]
}
}
}
},
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "dutch_analyzer"
}
}
}
}
Generated tokens
Use the following request to examine the tokens generated using the analyzer:
POST /dutch-index/_analyze
{
"field": "content",
"text": "De studenten studeren in Nederland en bezoeken Amsterdam. Hun nummers zijn 123456."
}
The response contains the generated tokens:
{
"tokens": [
{"token": "student","start_offset": 3,"end_offset": 12,"type": "<ALPHANUM>","position": 1},
{"token": "studer","start_offset": 13,"end_offset": 21,"type": "<ALPHANUM>","position": 2},
{"token": "nederland","start_offset": 25,"end_offset": 34,"type": "<ALPHANUM>","position": 4},
{"token": "bezoek","start_offset": 38,"end_offset": 46,"type": "<ALPHANUM>","position": 6},
{"token": "amsterdam","start_offset": 47,"end_offset": 56,"type": "<ALPHANUM>","position": 7},
{"token": "nummer","start_offset": 62,"end_offset": 69,"type": "<ALPHANUM>","position": 9},
{"token": "123456","start_offset": 75,"end_offset": 81,"type": "<NUM>","position": 11}
]
}