Meltwater.com is in the same space but is much older — it was founded in 2001.
Their engineering team recently blogged  about their petabyte-size Elasticsearch cluster which still uses a much older version of ES (1.7.x).
0: Optimal Shard Placement in a Petabyte Scale Elasticsearch Cluster
We powered their blog data back in the day. They acquired a smaller company in the space and incorporated their stack and used us for about 5 years.
With respect to the acquisition, is the smaller company Wrapidity?