Tests

NGSTACK-788 return 0 when max score is null #164

Job	Run time
8.1 unit	39s
8.1 integration legacy	45s
8.1 integration solr 7.7.3 single	3m 3s
8.1 integration solr 7.7.3 dedicated	1m 45s
8.1 integration solr 7.7.3 shared	1m 38s
8.1 integration solr 7.7.3 cloud	2m 14s
8.1 integration solr 7.7.3 regression single	15m 7s
8.1 integration solr 7.7.3 regression dedicated	15m 51s
8.1 integration solr 7.7.3 regression shared	17m 8s
8.1 integration solr 7.7.3 regression cloud	30m 18s
8.1 integration solr 8.11.2 single	1m 54s
8.1 integration solr 8.11.2 dedicated	1m 54s
8.1 integration solr 8.11.2 shared	2m 11s
8.1 integration solr 8.11.2 cloud	2m 2s
8.1 integration solr 8.11.2 regression single	15m 36s
8.1 integration solr 8.11.2 regression dedicated	18m 38s
8.1 integration solr 8.11.2 regression shared	17m 58s
8.1 integration solr 8.11.2 regression cloud	17m 51s
	2h 46m 32s

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