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> > To view this discussion on the web visit
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> > .
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### Author:  [@jpountz](https://discuss.elastic.co/u/jpountz)
#### Post date: [August 12, 2014, 1:46pm UTC](https://discuss.elastic.co/t/custom-aggregations/15740/7 "2014-08-12T13:46:56Z")
Hi Jin,
It is possible to write a custom aggregation, you can for example look at
this plugin: [GitHub - algolia/elasticsearch-cardinality-plugin: This plugin extends Elasticsearch providing a new type of aggregation and a REST action to estimate the cardinality (number of uniq terms) of a field.](https://github.com/algolia/elasticsearch-cardinality-plugin)
that implements a aggregation as a plugin.
If that would work for you, another option would be to contribute this
aggregation to Elaticsearch so that it would be available out of the box
(feel free to open an issue on Github and ping me (@jpountz), I'd be happy
to help).
On Sat, Aug 9, 2014 at 8:19 PM, Jin Huang [huang.jin.f@gmail.com](mailto:huang.jin.f@gmail.com) wrote:
> Hi Alex,
>
> Is there an updates on this topic? I want to know how easy or how complex
> is it to write a custom aggregator. For example, I want to calculate all
> the n-th central moments, with n=2,3,4,..10. By the way, Elasticsearch
> already provides the 2nd central moment, i.e. square of the standard
> deviation.
>
> In general, I would like to know what kind of custom aggregator is easy to
> write?
>
> Thanks,
> Jin
>
> On Wednesday, February 12, 2014 5:49:28 AM UTC-8, Alexander Reelsen wrote:
>
> > Hey,
> >
> > sure, you can write a custom plugin, which implements your custom
> > aggregations, if you want to.
> > Any specific functionality you are missing (might be interesting to get
> > it in the core anyway?).
> >
> > --Alex
> >
> > On Tue, Feb 11, 2014 at 9:41 PM, Justin Uang [justi...@gmail.com](mailto:justi...@gmail.com) wrote:
> >
> > > Is there any way we can define our own aggregation functions beyond the
> > > provided metric and bucket aggregations?
> > >
> > > Thanks!
> > >
> > > Justin
> > >
> > > --
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> > > [40googlegroups.com](http://40googlegroups.com).
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### Author:  [@xam](https://discuss.elastic.co/u/xam)
#### Post date: [April 7, 2017, 3:03pm UTC](https://discuss.elastic.co/t/custom-aggregations/15740/8 "2017-04-07T15:03:40Z")
Hi,
I need a n dimension adjacency matrix.
For example, if I have 3 filters A, B and C , I need to compute
A&B, B&A, C&A but also A&B&C
Unfortunatly, the new adjacency matrix in ES works for 2 dimentions.
I plan to develop a new MultiBucketsAggregation plugin, based on the current adjacency matrix. I now my aggregation will be performant only if I have a few filters, as the number of intersecting buckets will explode for n=3 or more.
Please let me know if my approach is correct.
Regards,
---
### Author:  [@jpountz](https://discuss.elastic.co/u/jpountz)
#### Post date: [April 7, 2017, 4:08pm UTC](https://discuss.elastic.co/t/custom-aggregations/15740/9 "2017-04-07T16:08:05Z")
It is, I just want to warn you that maintaining an aggregation is a lot of work as we don't guarantee API backward compatibility of the aggregations API. If your use-case is rather generic, maybe open a Github issue to explain it and we might consider supporting it.
---
### Author:  [@Pratheek](https://discuss.elastic.co/u/Pratheek)
#### Post date: [June 19, 2017, 11:47am UTC](https://discuss.elastic.co/t/custom-aggregations/15740/10 "2017-06-19T11:47:52Z")
Hi can you please let me know the steps on how to create a custom aggregation.I found some template in src folder in kibana,but where does the logic exist? (for example to perform addition,how does it take two input)
---
### Author:  [@Vikas\_Kumar1](https://discuss.elastic.co/u/Vikas_Kumar1)
#### Post date: [November 1, 2017, 12:09pm UTC](https://discuss.elastic.co/t/custom-aggregations/15740/11 "2017-11-01T12:09:37Z")
Hi
Can you share any link which can help to write a custom aggregation plugin. I don't even know how to start.Please help
---
### Author:  [@ciupam](https://discuss.elastic.co/u/ciupam)
#### Post date: [February 11, 2022, 3:58pm UTC](https://discuss.elastic.co/t/custom-aggregations/15740/12 "2022-02-11T15:58:01Z")
Hi, is there any way to use sum aggregation with multiple fields? I don't mean having two (or more) seperate sum aggregations as it takes twice the time as the single aggregation. If that's not possible with the sum aggregation is there any way to write a custom aggregation which resolves this issue (basically sums all the fields and returns an object)?
---
### Author:  [@Tomo\_M](https://discuss.elastic.co/u/Tomo_M)
#### Post date: [February 11, 2022, 4:27pm UTC](https://discuss.elastic.co/t/custom-aggregations/15740/13 "2022-02-11T16:27:50Z")
You may use sum aggregation for each fields, and use [bucket script aggregation](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-bucket-script-aggregation.html) to sum all.
It will take as long as the number of fields to be aggregated, but it should be faster than creating a custom script.
---
### Author:  [@ciupam](https://discuss.elastic.co/u/ciupam)
#### Post date: [February 12, 2022, 10:33am UTC](https://discuss.elastic.co/t/custom-aggregations/15740/14 "2022-02-12T10:33:17Z")
I was rather thinking of using one sum aggregation and get the same result as I'd get using multiple sum aggregations (I don't need summing up all the fields, I just need something less complex than iterating over each doc with each aggregation - to be precise I'm talking about 50 fields where each sum aggregation takes about 2-3s).
---
### Author:  [@Tomo\_M](https://discuss.elastic.co/u/Tomo_M)
#### Post date: [February 12, 2022, 12:17pm UTC](https://discuss.elastic.co/t/custom-aggregations/15740/15 "2022-02-12T12:17:47Z")
You could try [scripted metric aggregation](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-scripted-metric-aggregation.html). Though in general, scripts
> can’t use Elasticsearch’s index structures or related optimizations. This relationship can sometimes result in slower search speeds.
> [Scripts, caching, and search speed | Elasticsearch Guide [8.11] | Elastic](https://www.elastic.co/guide/en/elasticsearch/reference/current/scripts-and-search-speed.html)
it is worth trying and do performance test.
Depending on your use case, you may be able to speed up the process by periodically aggregating the data using [transform](https://www.elastic.co/guide/en/elasticsearch/reference/current/transforms.html), or by using the[ingest pipeline](https://www.elastic.co/guide/en/elasticsearch/reference/current/ingest.html) to pre-calculate the total value of the fields for each document at the time of ingest. Why don't you create a new post with your specific situation and the queries you want (query frequency, filtering conditions...) and discuss it with us?
---
### Author:  [@ciupam](https://discuss.elastic.co/u/ciupam)
#### Post date: [February 14, 2022, 2:40pm UTC](https://discuss.elastic.co/t/custom-aggregations/15740/16 "2022-02-14T14:40:23Z")
Thx for the answer, tried scripted metric aggregation - it takes twice as long to complete compared to multiple sum aggregations. I might come back some other time with the new post as transforming or pre-calculating values is sth that won't work for us.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [November 4, 2022, 4:01am UTC](https://discuss.elastic.co/t/custom-aggregations/15740/17 "2022-11-04T04:01:25Z")