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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| --- | ||
| layout: default | ||
| title: Remove duplicates | ||
| parent: Token filters | ||
| nav_order: 350 | ||
| --- | ||
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| # Remove duplicates token filter | ||
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| The `remove_duplicates` token filter is used to remove duplicate tokens that are generated in the same position during analysis. | ||
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| ## Example | ||
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| The following example request creates an index with a `keyword_repeat` token filter. The filter adds a `keyword` version of each token in the same position as the token itself and then uses a `kstem` to create a stemmed version of the token: | ||
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| ```json | ||
| PUT /example-index | ||
| { | ||
| "settings": { | ||
| "analysis": { | ||
| "analyzer": { | ||
| "custom_analyzer": { | ||
| "type": "custom", | ||
| "tokenizer": "standard", | ||
| "filter": [ | ||
| "lowercase", | ||
| "keyword_repeat", | ||
| "kstem" | ||
| ] | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| ``` | ||
| {% include copy-curl.html %} | ||
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| Use the following request to analyze the string `Slower turtle`: | ||
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| ```json | ||
| GET /example-index/_analyze | ||
| { | ||
| "analyzer": "custom_analyzer", | ||
| "text": "Slower turtle" | ||
| } | ||
| ``` | ||
| {% include copy-curl.html %} | ||
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| The response contains the token `turtle` twice in the same position: | ||
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| ```json | ||
| { | ||
| "tokens": [ | ||
| { | ||
| "token": "slower", | ||
| "start_offset": 0, | ||
| "end_offset": 6, | ||
| "type": "<ALPHANUM>", | ||
| "position": 0 | ||
| }, | ||
| { | ||
| "token": "slow", | ||
| "start_offset": 0, | ||
| "end_offset": 6, | ||
| "type": "<ALPHANUM>", | ||
| "position": 0 | ||
| }, | ||
| { | ||
| "token": "turtle", | ||
| "start_offset": 7, | ||
| "end_offset": 13, | ||
| "type": "<ALPHANUM>", | ||
| "position": 1 | ||
| }, | ||
| { | ||
| "token": "turtle", | ||
| "start_offset": 7, | ||
| "end_offset": 13, | ||
| "type": "<ALPHANUM>", | ||
| "position": 1 | ||
| } | ||
| ] | ||
| } | ||
| ``` | ||
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| The duplicate token can be removed by adding a `remove_duplicates` token filter to the index settings: | ||
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| ```json | ||
| PUT /index-remove-duplicate | ||
| { | ||
| "settings": { | ||
| "analysis": { | ||
| "analyzer": { | ||
| "custom_analyzer": { | ||
| "type": "custom", | ||
| "tokenizer": "standard", | ||
| "filter": [ | ||
| "lowercase", | ||
| "keyword_repeat", | ||
| "kstem", | ||
| "remove_duplicates" | ||
| ] | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| ``` | ||
| {% include copy-curl.html %} | ||
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| ## Generated tokens | ||
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| Use the following request to examine the tokens generated using the analyzer: | ||
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| ```json | ||
| GET /index-remove-duplicate/_analyze | ||
| { | ||
| "analyzer": "custom_analyzer", | ||
| "text": "Slower turtle" | ||
| } | ||
| ``` | ||
| {% include copy-curl.html %} | ||
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| The response contains the generated tokens: | ||
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| ```json | ||
| { | ||
| "tokens": [ | ||
| { | ||
| "token": "slower", | ||
| "start_offset": 0, | ||
| "end_offset": 6, | ||
| "type": "<ALPHANUM>", | ||
| "position": 0 | ||
| }, | ||
| { | ||
| "token": "slow", | ||
| "start_offset": 0, | ||
| "end_offset": 6, | ||
| "type": "<ALPHANUM>", | ||
| "position": 0 | ||
| }, | ||
| { | ||
| "token": "turtle", | ||
| "start_offset": 7, | ||
| "end_offset": 13, | ||
| "type": "<ALPHANUM>", | ||
| "position": 1 | ||
| } | ||
| ] | ||
| } | ||
| ``` |