Differences between keyword and icu_collation_keyword

Elastic Stack Elasticsearch
1

Hi, our mappings contain keyword field (type is keyword) for all properties which have type "text". This keyword is then used for term queries, sorting, aggregations, ... But sorting doesn't work well for some languages. Is it safe to change type from keyword to icu_collation_keyword? I tried some queries and it seems to me that results are the same and sorting works well. Could you please describe differences between type of keyword and icu_collation_keyword?

Version of ES: 6.7.2

Thank you!
Dan

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