Due to the changes in our application logging, one of the JSON fields
level1.level2.level3.version has changed its format from date-like "2018-05-23" to URL+date format like "https://CDN.server.com/template#2018-06-21". The initial field mapping was auto-generated by Elasticsearch server with type "date" and now it has recognized it as a "text" and marked the field with "conflict" type.
Now, when I do the search in Kibana, one of the shards is reported as having failure and the reason is
Fielddata is disabled on text fields by default. Set fielddata=true on [level1.level2.level3.version] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead.
By checking the index patterns in Kibana for that field, I can see that both
level1.level2.level3.version.keyword are created, but both are marked as searchable and aggregatable. I guess that only the keyword field should be aggregatable and that is what the error message is trying to say.
How can I mark the original field to be not aggregatable and re-map the history data into new format?