NGSTACK-805: async indexing #40

Job	Run time
8.1 unit	30s
8.1 integration legacy	40s
8.1 integration solr 7.7.3 single	1m 55s
8.1 integration solr 7.7.3 dedicated	1m 12s
8.1 integration solr 7.7.3 shared	2m 9s
8.1 integration solr 7.7.3 cloud	2m 41s
8.1 integration solr 7.7.3 regression single	15m 46s
8.1 integration solr 7.7.3 regression dedicated	15m 4s
8.1 integration solr 7.7.3 regression shared	19m 53s
8.1 integration solr 7.7.3 regression cloud	17m 10s
8.1 integration solr 8.11.2 single	1m 25s
8.1 integration solr 8.11.2 dedicated	3m 27s
8.1 integration solr 8.11.2 shared	1m 52s
8.1 integration solr 8.11.2 cloud	2m 48s
8.1 integration solr 8.11.2 regression single	12m 58s
8.1 integration solr 8.11.2 regression dedicated	20m 59s
8.1 integration solr 8.11.2 regression shared	15m 38s
8.1 integration solr 8.11.2 regression cloud	23m 49s
	2h 39m 56s

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