Syntax change for the include/exclude parameters of the (significant_)terms aggregation

[jpountz]

The syntax for regexps in the include/exclude parameters of the terms aggregation will change from Java regexps to Lucene regexps in Elasticsearch 2.0. So now it will be the same syntax as eg. the regexp query. Most users should not even notice the difference but if you use complex regexps, you might need to change them a bit.

See elastic/elasticsearch#10418 for more information

cc @rashidkpc

[jpountz]

Closing since 2.0 has been out for a long time now.