Yannick Welsch f6686345c9 Avoid unnecessary setup and teardown in docs tests (#51430)
The docs tests have recently been running much slower than before (see #49753).

The gist here is that with ILM/SLM we do a lot of unnecessary setup / teardown work on each
test. Compounded with the slightly slower cluster state storage mechanism, this causes the
tests to run much slower.

In particular, on RAMDisk, docs:check is taking

ES 7.4: 6:55 minutes
ES master: 16:09 minutes
ES with this commit: 6:52 minutes

on SSD, docs:check is taking

ES 7.4: ??? minutes
ES master: 32:20 minutes
ES with this commit: 11:21 minutes
2020-01-28 16:52:23 +01:00
..