Prevent omission of results from collections with different index styles #4869
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Fixes #3620
When performing a Search on a parent collection that has several sub-collections each with different types of indexes configured, The optimizer was optimizing the query without checking if all sub-collections were fit to be optimized.
#3620 has a nice test suit to illustrate this issue thanks to @joewiz. This PR now passes all of those tests.
This open source contribution to the exist project was commissioned by the Office of the Historian, U.S. Department of State, https://history.state.gov/.