How to debug an elastic4s failure?

Question

I have some elastic4s code which previously index documents successfully. Now, new documents aren't showing up.

How can I a) see the query sent to elasticsearch by elastic4s and b) see the response given, so that I can debug the indexing?

Answer 1

As @Ashalynd said in the comment you can use sense tool in order to try to figure out the problem.

Also i think you should use slow logging in order to figure the issue.

Check this article how to set the logging configuration in the logging.yml file.

*very important is to turn the debug off after you figure out things because its slow things down. (slow logging :))

slow logging

Answer 2

In answer to your first question about seeing the request sent to elasticsearch: I fumbled over this, too, and found insight in the unit tests. Look at IndexDslTest and SearchDslTest. The various *Request classes have a _builder that generates the query as JSON. Try this to see what's being sent to elasticsearch:

val req = index into ...
println(req._builder.toString)

Answer 3

In Elastic4s 1.6.2 you can use the show typeclass on a number of requests to get the JSON equivilent for debugging / easy testing in a REST client.

It's pretty straightforward.

val req = search in "index" / "type" query "kate bush"
logger.debug(s"Search request ${req.show}")

The .show method will render JSON output. It works on most of the request types.