Re-indexing into an existing index

[cwensel]

I am attempting to reindex an index into an already created/initialized index with new mapping configurations for given fields (but no existing data).

The tool does report success (though it does throw the dropped connection message) but the ES index is empty upon inspection.

If I target a non-existent index, the tool reports success (and the dropped connection message) and the ES index has all the relevant docs.

fwiw, I tried this with a very small number of docs ~100, so it isn't an issue of attempting to move gigs of data.