Ryan Ernst c3011cead4 Tests: Revamp static bwc test framework to use dangling indexes
The static old index tests currently take a long time to run because
each index version essentially recreates the cluster, and spins up
new nodes.  This PR instead loads each old version into the existing
cluster as a dangling index. It also removes the intermediate
"StaticIndexBackwardCompatibilityTest" which was an extra layer
with no purpose, and moves a shared version of a commonly found
function to get an http client.

The test now takes between 40 and 60 seconds for me. I also ran it
"under stress" by running all ES tests in one shell, while
simultaneously running 10 iterations of the old index tests. Each
iteration took on average about 90 seconds, which is much better
than the 20+ minutes we see in master on jenkins.

closes #10247
2015-04-03 23:21:55 -07:00
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