# Boost only first document matching criteria
**URL:** https://discuss.elastic.co/t/boost-only-first-document-matching-criteria/20555
**Category:** Elasticsearch
**Created:** [November 4, 2014, 11:11am UTC](https://discuss.elastic.co/t/boost-only-first-document-matching-criteria/20555 "2014-11-04T11:11:06Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Jurian\_Sluiman](https://discuss.elastic.co/u/Jurian_Sluiman)
#### Post date: [November 4, 2014, 11:11am UTC](https://discuss.elastic.co/t/boost-only-first-document-matching-criteria/20555/1 "2014-11-04T11:11:06Z")
This sounds perhaps as a non-ES use case, but I would like to have a single
document which has a certain flag boost to the top of the results.
I have ~10% of the documents with a flag. All documents (disregarding the
flag) are sorted on \_timestamp. All fields have a \_boost by default of 1.0.
Now I would like to keep the sort the same, _except_ for the _first
document_ matching a non-null value for specified flag. In other words, the
latest (chronologically) flagged document should be the 1st result, all
other documents (with or without flag) are sorted "just" based on
\_timestamp.
Is this possible with ES? I have been thinking about the ES index where I
set a \_boost value of \>1.0 for a flagged document and each time I insert a
new flagged document, I update all flagged documents in the index with a
boost of 1.0, effectively resetting the boost every time. But as this is
such a nasty solution, I hope ES users will help me with some more insights
🙂
--
Jurian
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 12:52am UTC](https://discuss.elastic.co/t/boost-only-first-document-matching-criteria/20555/2 "2017-07-06T00:52:17Z")