Commits on May 7, 2019

1. Remove Harmful Exists Check from BlobStoreFormat …

   * First off, this exists check is somewhat pointless in that it checks
   for the existence of a blob that contains a UUID in its name so we don't
   expect collisions here ever. Just checking for no name collision is
   completely sufficient.
   * More importantly though, this check introduces an issue on S3 because
   we will run it against a non existing snap-{uuid}.dat blob!
     * This leads to the fact that subsequent reads of this blob after it
   was written can still return a 404 because AWS S3 only guarantees first
   read after write consistency. If a read of a key is made before a write
   is made this guarantee goes out the window. (see
   https://docs.aws.amazon.com/AmazonS3/latest/dev/Introduction.html#ConsistencyModel
   for more)
   * Closes elastic#41882

   

   original-brownbear committed May 7, 2019
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