NGSTACK-836: descendant indexing #121

Job	Run time
8.1 unit	35s
8.1 integration legacy	40s
8.1 integration solr 7.7.3 single	1m 23s
8.1 integration solr 7.7.3 dedicated	3m 40s
8.1 integration solr 7.7.3 shared	3m 6s
8.1 integration solr 7.7.3 cloud	1m 58s
8.1 integration solr 7.7.3 regression single	13m 57s
8.1 integration solr 7.7.3 regression dedicated	14m 30s
8.1 integration solr 7.7.3 regression shared	15m 22s
8.1 integration solr 7.7.3 regression cloud	16m 0s
8.1 integration solr 8.11.2 single	1m 27s
8.1 integration solr 8.11.2 dedicated	1m 28s
8.1 integration solr 8.11.2 shared	2m 7s
8.1 integration solr 8.11.2 cloud	2m 24s
8.1 integration solr 8.11.2 regression single	20m 39s
8.1 integration solr 8.11.2 regression dedicated	22m 44s
8.1 integration solr 8.11.2 regression shared	4m 9s
8.1 integration solr 8.11.2 regression cloud	17m 33s
	2h 23m 42s

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