NGSTACK-836: descendant indexing #117

Job	Run time
8.1 unit	30s
8.1 integration legacy	42s
8.1 integration solr 7.7.3 single	1m 20s
8.1 integration solr 7.7.3 dedicated	1m 59s
8.1 integration solr 7.7.3 shared	3m 6s
8.1 integration solr 7.7.3 cloud	1m 56s
8.1 integration solr 7.7.3 regression single	12m 54s
8.1 integration solr 7.7.3 regression dedicated	14m 49s
8.1 integration solr 7.7.3 regression shared	15m 21s
8.1 integration solr 7.7.3 regression cloud	15m 15s
8.1 integration solr 8.11.2 single	1m 19s
8.1 integration solr 8.11.2 dedicated	1m 30s
8.1 integration solr 8.11.2 shared	3m 43s
8.1 integration solr 8.11.2 cloud	2m 0s
8.1 integration solr 8.11.2 regression single	16m 44s
8.1 integration solr 8.11.2 regression dedicated	14m 41s
8.1 integration solr 8.11.2 regression shared	16m 37s
8.1 integration solr 8.11.2 regression cloud	16m 30s
	2h 20m 56s

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