Hello,
This week we will be testing the new search infrastructure that has been spun up in our Ashburn data center. Search is currently running on some of our oldest hardware, so this should provide both better performance and reliability.
The first wiki that we will be testing is eswiki. We will start this test at 15:00 UTC, tomorrow, 4/4/12. (Or 4/4/12, for those not using American date formatting.) If that seems to run smoothly, we will rotate through the other shards, with enwiki and the "everything else" shard being last. Please respond to this thread if you see anything amiss, or let me know via irc (my nick is notpeter). Due to mostly speaking English, personally, help with other languages would be greatly appreciated!
Best, Peter