Somewhere on your website / farm, the elasticsearch server is running. This server has an index called product , and I would suggest that this index contains information about the products in your store. This elasticsearch server is currently experiencing some kind of problem, which is why the index is unavailable. You may be able to tell you what is happening by looking at the elasticsearch server log file, which is different from your web server log file. Do you see log files named elasticsearch.log ?
By the way, since several iterations may be required to find out what is happening, it would be easier to transfer this conversation to the elasticsearch mailing list or #elasticsearch IRC channel on freenode.
source share