public static String rename(String field,
Rename an offending field to a dynamic field. This particular pattern was chosen
for several reasons:
attr_* is defined in the default schema as "text_general" and multiValue.
This means that multiple values that we had to remove from original fields can be added
and we do a best effort to make them searchable.
suffix "_" prevents ambiguous field names that would match several dynamic
field patterns (e.g. "attr_foo_s" could match "attr_*" and "*_s", and which one would
prevail would be difficult to determine).