NGSTACK-836: descendant indexing #122

Job	Run time
8.1 unit	35s
8.1 integration legacy	51s
8.1 integration solr 7.7.3 single	1m 19s
8.1 integration solr 7.7.3 dedicated	3m 9s
8.1 integration solr 7.7.3 shared	1m 28s
8.1 integration solr 7.7.3 cloud	2m 8s
8.1 integration solr 7.7.3 regression single	13m 26s
8.1 integration solr 7.7.3 regression dedicated	14m 36s
8.1 integration solr 7.7.3 regression shared	20m 29s
8.1 integration solr 7.7.3 regression cloud	15m 45s
8.1 integration solr 8.11.2 single	1m 18s
8.1 integration solr 8.11.2 dedicated	3m 43s
8.1 integration solr 8.11.2 shared	1m 49s
8.1 integration solr 8.11.2 cloud	2m 14s
8.1 integration solr 8.11.2 regression single	14m 6s
8.1 integration solr 8.11.2 regression dedicated	14m 37s
8.1 integration solr 8.11.2 regression shared	16m 50s
8.1 integration solr 8.11.2 regression cloud	16m 24s
	2h 24m 47s

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