MassIndexingTest runs on CI in 10 mins with TRACE on and 3 mins with TRACE off. According to Sanne this shouldn't take that long:

sannegrinovero
11:50 mmarkus: the org.infinispan.query.distributed.MassIndexingTest test is adding 2000 entries to the cache. True that might be a bit excessive, still if it takes 10 minutes you have a problem in Infinispan core.
mmarkus
11:52 sannegrinovero: each such write is indexed I take it?
sannegrinovero
11:53 mmarkus: no: withFlags(Flag.SKIP_INDEXING)
11:54 mmarkus: but it's a 4 node DIST test using Map/Reduce.
sannegrinovero
11:54 then the Map/Reduce job does some indexing but the indexing engine didn't change overnight