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# Sampler Aggregation
> More info about histogram aggregation is in the [official elasticsearch docs][1]
A filtering aggregation used to limit any sub aggregations' processing to a sample of the top-scoring documents. Optionally,
diversity settings can be used to limit the number of matches that share a common value such as an "author".
## Simple example
```JSON
{
"aggregations": {
"sample": {
"sampler": {
"shard_size": 200,
"field" : "user.id"
},
"aggs": {
"keywords": {
"significant_terms": {
"field": "text"
}
}
}
}
}
}
```
And now the query via DSL:
```php
$samplerAggregation = new SamplerAggregation('sample', 'user.id', 200);
$samplerAggregation->addAggregation(
new SignificantTermsAggregation('keywords', 'text')
);
$search = new Search();
$search->addAggregation($samplerAggregation);
$queryArray = $search->toArray();
```
[1]: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-sampler-aggregation.html
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