# Terms order and boosting impact on performance
**URL:** https://discuss.elastic.co/t/terms-order-and-boosting-impact-on-performance/3106
**Category:** Elasticsearch
**Created:** [July 15, 2010, 1:16am UTC](https://discuss.elastic.co/t/terms-order-and-boosting-impact-on-performance/3106 "2010-07-15T01:16:40Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Michael\_Korbakov](https://discuss.elastic.co/u/Michael_Korbakov)
#### Post date: [July 15, 2010, 1:16am UTC](https://discuss.elastic.co/t/terms-order-and-boosting-impact-on-performance/3106/1 "2010-07-15T01:16:40Z")
Hi everyone!
Is there any way to give documents with a set of keywords different
relevance scores depending on keywords order?
For instance, if I have two documents with keywords like "AAA BBB CCC"
and "CCC DDD EEE", then I'd like to have second document to be scored
higher then first one when searching by "CCC". This represents
situation when most important keywords are entered first and less
important come after them.
Another question that is more of pure curiosity: is it possible to
harm search performance by setting 'boost' parameter in query?
Potentially it could as it involves additional operation during score
computation, but may be someone had a change to compare it in real use
cases?
-- Michael Korbakov
---
### Author:  [@kimchy](https://discuss.elastic.co/u/kimchy)
#### Post date: [August 1, 2010, 11:18am UTC](https://discuss.elastic.co/t/terms-order-and-boosting-impact-on-performance/3106/2 "2010-08-01T11:18:16Z")
This is possible, but requires writing a specialed somehow smart analyzer
and probably query for it. I can't think of another simple way to do it
(now)... . I do something along those lines for the all fields, where
boosted fields retain their boosted information when aggregated into the all
field.
-shay.banon
On Thu, Jul 15, 2010 at 4:16 AM, Mykhailo Korbakov [rmihael@gmail.com](mailto:rmihael@gmail.com)wrote:
> Hi everyone!
>
> Is there any way to give documents with a set of keywords different
> relevance scores depending on keywords order?
> For instance, if I have two documents with keywords like "AAA BBB CCC"
> and "CCC DDD EEE", then I'd like to have second document to be scored
> higher then first one when searching by "CCC". This represents
> situation when most important keywords are entered first and less
> important come after them.
>
> Another question that is more of pure curiosity: is it possible to
> harm search performance by setting 'boost' parameter in query?
> Potentially it could as it involves additional operation during score
> computation, but may be someone had a change to compare it in real use
> cases?
>
> -- Michael Korbakov
---
### Author:  [@Michael\_Korbakov](https://discuss.elastic.co/u/Michael_Korbakov)
#### Post date: [August 10, 2010, 10:23pm UTC](https://discuss.elastic.co/t/terms-order-and-boosting-impact-on-performance/3106/3 "2010-08-10T22:23:54Z")
I've managed to workaround this problems by adding special unique
token to the beginning of my keywords list and then doing phrase
search with very large slop (tried 1000). So my keyword list now look
in this way: "keywords": ["LONGUNIQUETOKENATLISTSTART", "AAA", "BBB",
"CCC", "DDD"]. After making sloped search with "query":
""LONGUNIQUETOKENATLISTSTART CCC"" I'm getting results with scores
depending on CCC position versus list start.
On Aug 1, 2:18 pm, Shay Banon [shay.ba...@elasticsearch.com](mailto:shay.ba...@elasticsearch.com) wrote:
> This is possible, but requires writing a specialed somehow smart analyzer
> and probably query for it. I can't think of another simple way to do it
> (now)... . I do something along those lines for the all fields, where
> boosted fields retain their boosted information when aggregated into the all
> field.
>
> -shay.banon
>
> On Thu, Jul 15, 2010 at 4:16 AM, Mykhailo Korbakov [rmih...@gmail.com](mailto:rmih...@gmail.com)wrote:
>
> > Hi everyone!
>
> > Is there any way to give documents with a set of keywords different
> > relevance scores depending on keywords order?
> > For instance, if I have two documents with keywords like "AAA BBB CCC"
> > and "CCC DDD EEE", then I'd like to have second document to be scored
> > higher then first one when searching by "CCC". This represents
> > situation when most important keywords are entered first and less
> > important come after them.
>
> > Another question that is more of pure curiosity: is it possible to
> > harm search performance by setting 'boost' parameter in query?
> > Potentially it could as it involves additional operation during score
> > computation, but may be someone had a change to compare it in real use
> > cases?
>
> > -- Michael Korbakov
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 4:20am UTC](https://discuss.elastic.co/t/terms-order-and-boosting-impact-on-performance/3106/4 "2017-07-06T04:20:58Z")