[Docs] Update tophits-aggregation.asciidoc
[[search-aggregations-metrics-top-hits-aggregation]]
-=== Top hits Aggregation
+=== Top Hits Aggregation
A `top_hits` metric aggregator keeps track of the most relevant document being aggregated. This aggregator is intended
to be used as a sub aggregator, so that the top matching documents can be aggregated per bucket.
