[BUGFIX] Allow matching more than one indexConfiguration for item

Multiple indexConfiguration-items might already match for an
item. Until now only "the best guess" (the first one returned)
was used which was kind of "random".
Change-Id: I5106ac1d953061d2a4441cccd386b597ff6e3635
Resolves: #43990
Reviewed-on: https://review.typo3.org/24989
Reviewed-by: Hans Höchtl
Tested-by: Hans Höchtl