Provide LMDB index recommendations in explain plans #6321

Job	Run time
copyright-check	29s
formatting-and-quick-compile	1m 28s
compile	3m 32s
integration-tests	14m 14s
build (11)	15m 2s
build (25)	13m 59s
e2e	8m 5s
package-assembly	4m 16s
slow-tests	20m 28s
	1h 21m 33s

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