Hi If I remember correctly, we no longer share doc stores (starting 3.1.0). While working on LUCENE-3126 I was thinking that perhaps addIndexes does not work well, or at least can be improved in that area.
Today, if you add an index (e.g. created with 2.9/3.0) and some segments share doc stores, they will still share the doc stores after copy. However, what if you use a merge policy, e.g. TieredMP, which assumes it can merge segments out-of-order? Will it work w/ shared doc-stores? How does the rest of the code work w/ segments that share doc stores? I assume that since we support index-format backwards, then the code works well. So maybe this isn't a bug. However, shouldn't we untie the doc stores, even if it means copying the DS to each segment, in IW.addIndexes? Shai
