GeoCentroid.md

Geo Centroid Aggregation

More info about histogram aggregation is in the official elasticsearch docs

A metric aggregation that computes the weighted centroid from all coordinate values for a Geo-point datatype field. The data type of the field that is specified for the aggregation must be geo-point.

Simple example

{
    "query" : {
        "match" : { "crime" : "burglary" }
    },
    "aggs" : {
        "centroid" : {
            "geo_centroid" : {
                "field" : "location"
            }
        }
    }
}

And now the query via DSL:

$geoCentroidAggregation = new GeoCentroidAggregation('centroid', 'location');

$search = new Search();
$search->addQuery(new MatchQuery('crime', 'burglary'));
$search->addAggregation($geoCentroidAggregation);

$queryArray = $search->toArray();

Advanced example

The query provides more information when when combined as a sub-aggregation to other bucket aggregations. Here is an example of that:

{
    "query" : {
        "match" : { "crime" : "burglary" }
    },
    "aggs" : {
        "towns" : {
            "terms" : { "field" : "town" },
            "aggs" : {
                "centroid" : {
                    "geo_centroid" : { "field" : "location" }
                }
            }
        }
    }
}

And now via DSL:

$geoCentroidAggregation = new GeoCentroidAggregation('centroid', 'location');
$termsAggregation = new TermsAggregation('towns', 'town');
$termsAggregation->addAggregation($geoCentroidAggregation);

$search = new Search();
$search->addQuery(new MatchQuery('crime', 'burglary'));
$search->addAggregation($termsAggregation);

$queryArray = $search->toArray();