Fix stack overflow in _cat/recovery test.
Fix stack overflow in _cat/recovery test.

This fixes a stack overflow in the test for the _cat/recovery API.
The regular expression that tests the response body was modified to
handle large responses properly.

vorce/es-metrics,aparo/elasticsearch,vorce/es-metrics,aparo/elasticsearch,vorce/es-metrics,fubuki/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,vorce/es-metrics,fubuki/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,aparo/elasticsearch,aparo/elasticsearch,vorce/es-metrics,fubuki/elasticsearch,fubuki/elasticsearch