Fix format problem in composite of unmapped (backport of #50869) #50875
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When a composite aggregation is reduced using the results from an
index that has one of the fields unmapped we were throwing away the
formatter. This is mildly annoying, except in the case of IP addresses
which were coming out as non-utf-8-characters. And tripping assertions.
This carefully preserves the formatter from the working bucket.
Closes #50600