Cross Index Migration

Hello,

I am trying to migrate my Indexes with version upgrade.

The challenge here is I want to migrate the data to a modified index i.e. with less number fields and change in Field type on need basis.

Example:

If Index1 has 10 fields, I do not want to migrate all 10 fields since I am not making use of couple of fields i want to skip them and migrate the rest of the data. Also all the Type has to be changed to String to Keyword

Have you looked at the reindex API? https://www.elastic.co/guide/en/elasticsearch/reference/5.5/docs-reindex.html

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