NGSTACK-836: descendant indexing #113

Job	Run time
8.1 unit	40s
8.1 integration legacy	54s
8.1 integration solr 7.7.3 single	1m 23s
8.1 integration solr 7.7.3 dedicated	1m 38s
8.1 integration solr 7.7.3 shared	1m 35s
8.1 integration solr 7.7.3 cloud	2m 18s
8.1 integration solr 7.7.3 regression single	13m 49s
8.1 integration solr 7.7.3 regression dedicated	4m 10s
8.1 integration solr 7.7.3 regression shared	15m 17s
8.1 integration solr 7.7.3 regression cloud	15m 30s
8.1 integration solr 8.11.2 single	1m 39s
8.1 integration solr 8.11.2 dedicated	1m 45s
8.1 integration solr 8.11.2 shared	2m 6s
8.1 integration solr 8.11.2 cloud	2m 4s
8.1 integration solr 8.11.2 regression single	14m 15s
8.1 integration solr 8.11.2 regression dedicated	15m 3s
8.1 integration solr 8.11.2 regression shared	16m 51s
8.1 integration solr 8.11.2 regression cloud	16m 10s
	2h 7m 7s

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