Hi there,
I have lots of indices that created and pump lots of data in v1.7.2. We are going to upgrade to 5.4.0 recently, I wonder do we have any solution that smoothly migrate data to new version?
Without _source, you cannot use the Reindex API. And without the reindex API, you cannot hope to do a one-shot, in-place migration from 1.7 to 5.4, as the Lucene data structures of the 1.7 indices are not compatible.
You may be able to go to 2.x, add and remove a document, do a forceMerge, and force the segments to a newer format, then do an in-place upgrade to 5.x. I say may because I'm still not 100% this can be done.
Not having _source has kind of hamstrung your upgrade path.
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