NGSTACK-836: descendant indexing #125

Job	Run time
8.1 unit	31s
8.1 integration legacy	44s
8.1 integration solr 7.7.3 single	1m 20s
8.1 integration solr 7.7.3 dedicated	1m 23s
8.1 integration solr 7.7.3 shared	1m 24s
8.1 integration solr 7.7.3 cloud	1m 52s
8.1 integration solr 7.7.3 regression single	12m 51s
8.1 integration solr 7.7.3 regression dedicated	14m 26s
8.1 integration solr 7.7.3 regression shared	17m 4s
8.1 integration solr 7.7.3 regression cloud	15m 20s
8.1 integration solr 8.11.2 single	1m 31s
8.1 integration solr 8.11.2 dedicated	2m 9s
8.1 integration solr 8.11.2 shared	1m 50s
8.1 integration solr 8.11.2 cloud	1m 53s
8.1 integration solr 8.11.2 regression single	13m 41s
8.1 integration solr 8.11.2 regression dedicated	14m 50s
8.1 integration solr 8.11.2 regression shared	16m 31s
8.1 integration solr 8.11.2 regression cloud	18m 35s
	2h 17m 55s

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