NGSTACK-836: descendant indexing #64

Job	Run time
8.1 unit	40s
8.1 integration legacy	45s
8.1 integration solr 7.7.3 single	3m 55s
8.1 integration solr 7.7.3 dedicated	4m 9s
8.1 integration solr 7.7.3 shared	3m 0s
8.1 integration solr 7.7.3 cloud	3m 30s
8.1 integration solr 7.7.3 regression single	15m 21s
8.1 integration solr 7.7.3 regression dedicated	17m 6s
8.1 integration solr 7.7.3 regression shared	19m 21s
8.1 integration solr 7.7.3 regression cloud	17m 8s
8.1 integration solr 8.11.2 single	3m 40s
8.1 integration solr 8.11.2 dedicated	4m 35s
8.1 integration solr 8.11.2 shared	5m 14s
8.1 integration solr 8.11.2 cloud	4m 56s
8.1 integration solr 8.11.2 regression single	15m 53s
8.1 integration solr 8.11.2 regression dedicated	17m 18s
8.1 integration solr 8.11.2 regression shared	19m 57s
8.1 integration solr 8.11.2 regression cloud	22m 34s
	2h 59m 2s

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