NGSTACK-836: descendant indexing #130

Job	Run time
8.1 unit	30s
8.1 integration legacy	48s
8.1 integration solr 7.7.3 single	4m 1s
8.1 integration solr 7.7.3 dedicated	2m 12s
8.1 integration solr 7.7.3 shared	5m 40s
8.1 integration solr 7.7.3 cloud	4m 53s
8.1 integration solr 7.7.3 regression single	16m 34s
8.1 integration solr 7.7.3 regression dedicated	14m 5s
8.1 integration solr 7.7.3 regression shared	18m 0s
8.1 integration solr 7.7.3 regression cloud	16m 43s
8.1 integration solr 8.11.2 single	3m 3s
8.1 integration solr 8.11.2 dedicated	5m 33s
8.1 integration solr 8.11.2 shared	2m 6s
8.1 integration solr 8.11.2 cloud	3m 22s
8.1 integration solr 8.11.2 regression single	14m 3s
8.1 integration solr 8.11.2 regression dedicated	16m 13s
8.1 integration solr 8.11.2 regression shared	20m 56s
8.1 integration solr 8.11.2 regression cloud	17m 10s
	2h 45m 52s

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