I have a CCS environment setup, using the guide here. It contains two data nodes and one controlling node. Both data nodes contain the same index, test, with a single document in each. One data node is running off :9201, the other off :9202. The controlling node is running off :9220.

This request is good:

curl -XPOST localhost:9201/t/_search -i
HTTP/1.1 404 Not Found

However, this request is unexpected:

curl -XPOST localhost:9220/*:t/_search -i
HTTP/1.1 500 Internal Server Error

(curl -XPOST localhost:9220/cluster_one:t/_search -i and curl -XPOST localhost:9220/cluster_two:t/_search -i return the same 500 too.)

I'm assuming the connecting node is detecting the 404 from the data nodes and is converting that into a 500, but I'm not sure it should do that. The connecting node should probably inspect the type of error and return the same error type instead of the 500.