Portuguese analyzer

The built-in portuguese analyzer can be applied to a text field using the following command:

  1. PUT /portuguese-index
  2. {
  3.   "mappings": {
  4.     "properties": {
  5.       "content": {
  6.         "type": "text",
  7.         "analyzer": "portuguese"
  8.       }
  9.     }
  10.   }
  11. }

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Stem exclusion

You can use stem_exclusion with this language analyzer using the following command:

  1. PUT index_with_stem_exclusion_portuguese_analyzer
  2. {
  3.   "settings": {
  4.     "analysis": {
  5.       "analyzer": {
  6.         "stem_exclusion_portuguese_analyzer": {
  7.           "type": "portuguese",
  8.           "stem_exclusion": ["autoridade", "aprovação"]
  9.         }
  10.       }
  11.     }
  12.   }
  13. }

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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:

  1. PUT /portuguese-index
  2. {
  3.   "settings": {
  4.     "analysis": {
  5.       "filter": {
  6.         "portuguese_stop": {
  7.           "type": "stop",
  8.           "stopwords": "_portuguese_"
  9.         },
  10.         "portuguese_stemmer": {
  11.           "type": "stemmer",
  12.           "language": "light_portuguese"
  13.         },
  14.         "portuguese_keywords": {
  15.           "type": "keyword_marker",
  16.           "keywords": []
  17.         }
  18.       },
  19.       "analyzer": {
  20.         "portuguese_analyzer": {
  21.           "type": "custom",
  22.           "tokenizer": "standard",
  23.           "filter": [
  24.             "lowercase",
  25.             "portuguese_stop",
  26.             "portuguese_keywords",
  27.             "portuguese_stemmer"
  28.           ]
  29.         }
  30.       }
  31.     }
  32.   },
  33.   "mappings": {
  34.     "properties": {
  35.       "content": {
  36.         "type": "text",
  37.         "analyzer": "portuguese_analyzer"
  38.       }
  39.     }
  40.   }
  41. }

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Generated tokens

Use the following request to examine the tokens generated using the analyzer:

  1. POST /portuguese-index/_analyze
  2. {
  3.   "field": "content",
  4.   "text": "Os estudantes estudam nas universidades brasileiras. Seus números são 123456."
  5. }

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The response contains the generated tokens:

  1. {
  2.   "tokens": [
  3.     {
  4.       "token": "estudant",
  5.       "start_offset": 3,
  6.       "end_offset": 13,
  7.       "type": "<ALPHANUM>",
  8.       "position": 1
  9.     },
  10.     {
  11.       "token": "estudam",
  12.       "start_offset": 14,
  13.       "end_offset": 21,
  14.       "type": "<ALPHANUM>",
  15.       "position": 2
  16.     },
  17.     {
  18.       "token": "universidad",
  19.       "start_offset": 26,
  20.       "end_offset": 39,
  21.       "type": "<ALPHANUM>",
  22.       "position": 4
  23.     },
  24.     {
  25.       "token": "brasileir",
  26.       "start_offset": 40,
  27.       "end_offset": 51,
  28.       "type": "<ALPHANUM>",
  29.       "position": 5
  30.     },
  31.     {
  32.       "token": "numer",
  33.       "start_offset": 58,
  34.       "end_offset": 65,
  35.       "type": "<ALPHANUM>",
  36.       "position": 7
  37.     },
  38.     {
  39.       "token": "123456",
  40.       "start_offset": 70,
  41.       "end_offset": 76,
  42.       "type": "<NUM>",
  43.       "position": 9
  44.     }
  45.   ]
  46. }