elasticsearch/elasticsearch — pull request #6142 by jpountz (2014-05-13 07:49:37+00:00)
Title: Use t-digest as a dependency.

Our improvements to t-digest have been pushed upstream and t-digest also got
some additional nice improvements around memory usage and speedups of quantile
estimation. So it makes sense to use it as a dependency now.

This also allows to remove the test dependency on Apache Mahout.