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1. Figure out how many single index solns 2.4 would explore.

2. Explore the same number in 2.6

3. Don't explore tons of ixisect solns while doing this...should still cap the # of those explored pretty low.

is duplicated by

SERVER-1215 speculatively evaluate multiple query plans for each $or clause (even after 101 matches found for query)

is related to

SERVER-13104 Plan enumerator doesn't enumerate all possibilities for a nested $or

SERVER-13236 Consider not enumerating index intersection solutions unless the AND is top-level

related to

SERVER-13732 Predicates in top-level implicit AND query not considered when generating index access plan for contained OR