Elasticsearch 5 brings with it the removal of the string type and has been replaced with text and keyword.
General Solutions
Analyze your mappings and look for string mapping types. You will want to review how you use those fields to determine if you should use text or keyword going forward.
text: you want full text search analysis on
keyword: you want to search for the value exactly as is, a PO Number, or url for example
From 2.x
There are no specific tricks for this upgrade process, outside of the General Solution listed above. We would simply recommend you follow our traditional process for testing your searches on a new version of Elasticsearch.
From 1.x
There are no specific tricks for this upgrade process, outside of the General Solution listed above. We would simply recommend you follow our traditional process for testing your searches on a new version of Elasticsearch.
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