Move FieldMapper#valueFetcher to MappedFieldType (#62974) #63220
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For runtime fields, we will want to do all search-time interaction with a field definition via a MappedFieldType, rather than a FieldMapper, to avoid interfering with the logic of document parsing. Currently, fetching values for runtime scripts and for building top hits responses need to call a method on FieldMapper. This commit moves this method to MappedFieldType, incidentally simplifying the current call sites and freeing us up to implement runtime fields as pure MappedFieldType objects.
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For runtime fields, we will want to do all search-time interaction with
a field definition via a MappedFieldType, rather than a FieldMapper, to
avoid interfering with the logic of document parsing. Currently, fetching
values for runtime scripts and for building top hits responses need to
call a method on FieldMapper. This commit moves this method to
MappedFieldType, incidentally simplifying the current call sites and freeing
us up to implement runtime fields as pure MappedFieldType objects.