Hi,
I'm facing similar problem. I found a possible way, how to copy a
part of index (w/o copy whole index,delete,optimize), but don't know how
to change/add/remove field (or add term vector in my case) to existing
index.
To copy a part of index override methods in IndexReader
/** Returns true if document <i>n</i> has been deleted */
public abstract boolean isDeleted(int n);
/** Returns true if any documents have been deleted */
public abstract boolean hasDeletions();
and use addIndexes when it has a just one segment.
I have not tested it yet, just an idea from reading source code.
Karel
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