--no-recreate-index should actually prevent recreating index

[jcphill]

Currently --no-recreate-index is just the default behavior of "don't recreate the index unless necessary". What would actually be useful is for it to mean "either use the existing index as-is or exit with an error".

[mxmlnkn]

That would require a new option --recreate-index-on-error to restore / force the default behavior in case it somehow is not the default anymore, but it seems useful enough to add this because, yes, no-recreate-index, is misleading as far as names go.