# Prioritize exact match using nGram

**URL:** <https://discuss.elastic.co/t/prioritize-exact-match-using-ngram/15372>\
**Category:** Elasticsearch\
**Created:** [January 23, 2014, 4:07am UTC](https://discuss.elastic.co/t/prioritize-exact-match-using-ngram/15372 "2014-01-23T04:07:18Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Nikhil\_Podduturi](https://avatars.discourse-cdn.com/v4/letter/n/d07c76/32.png) [@Nikhil\_Podduturi](https://discuss.elastic.co/u/Nikhil_Podduturi)\
**Post date:** [January 23, 2014, 4:07am UTC](https://discuss.elastic.co/t/prioritize-exact-match-using-ngram/15372/1 "2014-01-23T04:07:18Z")

</div>

Hello All,

I am wondering how to rank exact match higher than the nGram matches.

For example:

search string: _abcd_  
results - abcd, abcde, abcdegl

not in a particular order.

But I want to rank 'abcd' higher than the rest. Is it possible??  
I am adding my mappings, analyzers and query below.

mapping for a particular field:

{  
'type': 'multi\_field',  
'fields': {  
'name': {  
'type': 'string',  
'search\_analyzer': 'search\_analyzer',  
'index\_analyzer': 'index\_analyzer',  
'include\_in\_all': True  
},  
'untouched': {  
'type': 'string',  
'index': 'not\_analyzed',  
'include\_in\_all': False,  
},  
'standard': {  
'type': 'string',  
'analyzer': 'search\_analyzer',  
'include\_in\_all': False  
}  
},  
}

My analyzers:

{  
'settings': {  
'analysis': {  
'filter': {  
'substring': {  
'type': 'nGram',  
'min\_gram': 1,  
'max\_gram': 25  
}  
},  
'analyzer': {  
'index\_analyzer': {  
'type': 'custom',  
'tokenizer': 'standard',  
'filter': [  
'standard',  
'lowercase',  
'asciifolding',  
'substring'  
]  
},  
'search\_analyzer': {  
'type': 'custom',  
'tokenizer': 'standard',  
'filter': [  
'standard',  
'lowercase',  
'asciifolding'  
]  
}  
}  
}  
}  
}

query (I am searching in all fields'\_all')

{  
'query': {  
'query\_string': {  
'query': 'abcd',  
'analyze\_wildcard': True,  
'analyzer': 'search\_analyzer',  
'default\_operator': 'AND'  
}  
},  
}

Thanks,  
Nikhil

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---

<div class="post-metadata">

**Author:** ![Binh\_Ly](https://avatars.discourse-cdn.com/v4/letter/b/ce7236/32.png) [@Binh\_Ly](https://discuss.elastic.co/u/Binh_Ly)\
**Post date:** [January 23, 2014, 6:24pm UTC](https://discuss.elastic.co/t/prioritize-exact-match-using-ngram/15372/2 "2014-01-23T18:24:35Z")

</div>

Nikhil,

Try to take a look at the function\_score query. You should be able to  
inject a function with say a term filter and provide an override  
(script\_score) or boost (boost\_factor) to perform the exact match boosting.

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On Wednesday, January 22, 2014 11:07:18 PM UTC-5, Nikhil Podduturi wrote:

> Hello All,
> 
> I am wondering how to rank exact match higher than the nGram matches.
> 
> For example:
> 
> search string: _abcd_  
> results - abcd, abcde, abcdegl
> 
> not in a particular order.
> 
> But I want to rank 'abcd' higher than the rest. Is it possible??  
> I am adding my mappings, analyzers and query below.
> 
> mapping for a particular field:
> 
> {  
> 'type': 'multi\_field',  
> 'fields': {  
> 'name': {  
> 'type': 'string',  
> 'search\_analyzer': 'search\_analyzer',  
> 'index\_analyzer': 'index\_analyzer',  
> 'include\_in\_all': True  
> },  
> 'untouched': {  
> 'type': 'string',  
> 'index': 'not\_analyzed',  
> 'include\_in\_all': False,  
> },  
> 'standard': {  
> 'type': 'string',  
> 'analyzer': 'search\_analyzer',  
> 'include\_in\_all': False  
> }  
> },  
> }
> 
> My analyzers:
> 
> {  
> 'settings': {  
> 'analysis': {  
> 'filter': {  
> 'substring': {  
> 'type': 'nGram',  
> 'min\_gram': 1,  
> 'max\_gram': 25  
> }  
> },  
> 'analyzer': {  
> 'index\_analyzer': {  
> 'type': 'custom',  
> 'tokenizer': 'standard',  
> 'filter': [  
> 'standard',  
> 'lowercase',  
> 'asciifolding',  
> 'substring'  
> ]  
> },  
> 'search\_analyzer': {  
> 'type': 'custom',  
> 'tokenizer': 'standard',  
> 'filter': [  
> 'standard',  
> 'lowercase',  
> 'asciifolding'  
> ]  
> }  
> }  
> }  
> }  
> }
> 
> query (I am searching in all fields'\_all')
> 
> {  
> 'query': {  
> 'query\_string': {  
> 'query': 'abcd',  
> 'analyze\_wildcard': True,  
> 'analyzer': 'search\_analyzer',  
> 'default\_operator': 'AND'  
> }  
> },  
> }
> 
> Thanks,  
> Nikhil

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---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 1:55am UTC](https://discuss.elastic.co/t/prioritize-exact-match-using-ngram/15372/3 "2017-07-06T01:55:07Z")

</div>