Curious observation on copying an index

Windoz 7: ES 1.3.2: added some 6 million documents distributed over two
index instances.

Decided to "bookmark" that collection by copying it to another directory in
case something crashed going forward.

Something crashed.

Copied the clone back to the index directory. On booting and looking at it
from the Elastic HQ viewer, I could see that it recorded the size of one of
the index, but showed 0 documents in it. The other (smaller) index still
showed all its documents and proper size.

What happened?

Thanks in advance for ideas.
Jack

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