NGSTACK-836: descendant indexing #127

Job	Run time
8.1 unit	30s
8.1 integration legacy	40s
8.1 integration solr 7.7.3 single	1m 15s
8.1 integration solr 7.7.3 dedicated	1m 42s
8.1 integration solr 7.7.3 shared	1m 30s
8.1 integration solr 7.7.3 cloud	1m 51s
8.1 integration solr 7.7.3 regression single	13m 36s
8.1 integration solr 7.7.3 regression dedicated	4m 11s
8.1 integration solr 7.7.3 regression shared	16m 0s
8.1 integration solr 7.7.3 regression cloud	15m 50s
8.1 integration solr 8.11.2 single	1m 19s
8.1 integration solr 8.11.2 dedicated	1m 41s
8.1 integration solr 8.11.2 shared	1m 51s
8.1 integration solr 8.11.2 cloud	3m 57s
8.1 integration solr 8.11.2 regression single	13m 46s
8.1 integration solr 8.11.2 regression dedicated	4m 10s
8.1 integration solr 8.11.2 regression shared	16m 9s
8.1 integration solr 8.11.2 regression cloud	16m 27s
	1h 56m 25s

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