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Portuguese analyzer
The built-in portuguese analyzer can be applied to a text field using the following command:
PUT /portuguese-index
{
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "portuguese"
}
}
}
}
Stem exclusion
You can use stem_exclusion with this language analyzer using the following command:
PUT index_with_stem_exclusion_portuguese_analyzer
{
"settings": {
"analysis": {
"analyzer": {
"stem_exclusion_portuguese_analyzer": {
"type": "portuguese",
"stem_exclusion": ["autoridade", "aprovação"]
}
}
}
}
}
Portuguese analyzer internals
The portuguese analyzer is built using the following components:
-
Tokenizer:
standard -
Token filters:
- lowercase
- stop (Portuguese)
- keyword
- stemmer (Portuguese)
Custom Portuguese analyzer
You can create a custom Portuguese analyzer using the following command:
PUT /portuguese-index
{
"settings": {
"analysis": {
"filter": {
"portuguese_stop": {
"type": "stop",
"stopwords": "_portuguese_"
},
"portuguese_stemmer": {
"type": "stemmer",
"language": "light_portuguese"
},
"portuguese_keywords": {
"type": "keyword_marker",
"keywords": []
}
},
"analyzer": {
"portuguese_analyzer": {
"type": "custom",
"tokenizer": "standard",
"filter": [
"lowercase",
"portuguese_stop",
"portuguese_keywords",
"portuguese_stemmer"
]
}
}
}
},
"mappings": {
"properties": {
"content": {
"type": "text",
"analyzer": "portuguese_analyzer"
}
}
}
}
Generated tokens
Use the following request to examine the tokens generated using the analyzer:
POST /portuguese-index/_analyze
{
"field": "content",
"text": "Os estudantes estudam nas universidades brasileiras. Seus números são 123456."
}
The response contains the generated tokens:
{
"tokens": [
{
"token": "estudant",
"start_offset": 3,
"end_offset": 13,
"type": "<ALPHANUM>",
"position": 1
},
{
"token": "estudam",
"start_offset": 14,
"end_offset": 21,
"type": "<ALPHANUM>",
"position": 2
},
{
"token": "universidad",
"start_offset": 26,
"end_offset": 39,
"type": "<ALPHANUM>",
"position": 4
},
{
"token": "brasileir",
"start_offset": 40,
"end_offset": 51,
"type": "<ALPHANUM>",
"position": 5
},
{
"token": "numer",
"start_offset": 58,
"end_offset": 65,
"type": "<ALPHANUM>",
"position": 7
},
{
"token": "123456",
"start_offset": 70,
"end_offset": 76,
"type": "<NUM>",
"position": 9
}
]
}