Index municipality names as keywords instead of as plain text. This prevents
them from being split at word separators. Thereby avoiding that searches for a
municipality name, as used by the frontend's municipality filter, return
organisations whose municipality is a partial match.
For example, previously the results when searching for "Puurs" also included the
organisations located in "Sint-Amands-Puurs". The latter was tokenized into
three terms, therefore also matching plain "Puurs". By treating the municipality
name as keyword this split non longer happens.
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