# Dictionary decompounder: only longest match doesn't work
**URL:** https://discuss.elastic.co/t/dictionary-decompounder-only-longest-match-doesnt-work/303598
**Category:** Elasticsearch
**Created:** [April 29, 2022, 11:49am UTC](https://discuss.elastic.co/t/dictionary-decompounder-only-longest-match-doesnt-work/303598 "2022-04-29T11:49:56Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Arisara\_Pornwattanav](https://discuss.elastic.co/u/Arisara_Pornwattanav)
#### Post date: [April 29, 2022, 11:49am UTC](https://discuss.elastic.co/t/dictionary-decompounder-only-longest-match-doesnt-work/303598/1 "2022-04-29T11:49:56Z")
Hi I have problem with analyzer: dictionary decompounder. I need the analyzer output as the longest word that match the dictionary.
So, I set the word\_list: theredapple, redapple, apple
and I also set **only\_longest\_match: true** as follows:
```auto
{
"settings": {
"analysis": {
"analyzer": {
"standard_dictionary_decompound": {
"tokenizer": "whitespace",
"filter": ["22_char_dictionary_decompound", "lowercase"]
}
},
"filter": {
"22_char_dictionary_decompound": {
"type": "dictionary_decompounder",
"word_list": ["theredpple","redapple", "apple"],
"max_subword_size": 50,
"only_longest_match":true
}
}
}
}
}
```
Then I test the custom analyzer on URL/\_analyze
with
```auto
{
"text":"theredapple",
"analyzer":"standard_dictionary_decompound"
}
```
The result was:
```auto
{
"tokens": [
{
"token": "theredapple",
"start_offset": 0,
"end_offset": 11,
"type": "word",
"position": 0
},
{
"token": "redapple",
"start_offset": 0,
"end_offset": 11,
"type": "word",
"position": 0
},
{
"token": "apple",
"start_offset": 0,
"end_offset": 11,
"type": "word",
"position": 0
}
]
}
```
Which **is not what I expect**. I think if I set **only\_longest\_match:true** , the result might be **only theredapple** , not redapple and apple
Any suggestion about set **only\_longest\_match:true ?.** Or I misunderstand something?
Thank for your help.
---
### Author:  [@spinscale](https://discuss.elastic.co/u/spinscale)
#### Post date: [May 5, 2022, 1:55pm UTC](https://discuss.elastic.co/t/dictionary-decompounder-only-longest-match-doesnt-work/303598/2 "2022-05-05T13:55:52Z")
That's a good question. I asked around and learned that this means only use the longest match for a given start point. `theredapple` and `redapple` start at different positions so are assumed different tokens, where as `redapple` and `redpear` would only return the longest tokens.
Hope that helps.
---
### Author:  [@Arisara\_Pornwattanav](https://discuss.elastic.co/u/Arisara_Pornwattanav)
#### Post date: [May 6, 2022, 5:29am UTC](https://discuss.elastic.co/t/dictionary-decompounder-only-longest-match-doesnt-work/303598/3 "2022-05-06T05:29:34Z")
Ohhh I got it Thank youu
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 3, 2022, 5:29am UTC](https://discuss.elastic.co/t/dictionary-decompounder-only-longest-match-doesnt-work/303598/4 "2022-06-03T05:29:56Z")
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