ElasticSearch query fails on ES 6

Issue Summary

Using the public docker images which seem to be based on Redash 4 (beta?) trying to setup a query for an ES 6 backend results in

Error running query: Failed to execute query. Return Code: 500 Reason: {"error":{"root_cause":[{"type":"illegal_state_exception","reason":"source and source_content_type parameters are required"}],"type":"illegal_state_exception","reason":"source and source_content_type parameters are required"},"status":500}

Steps to Reproduce

1. Deploy redash using the redash docker compose file
2. Deploy ES 6 backend
3. Setup ElasticSearch datasource in Redash
4. Try a simple query

Technical details:

• Redash Version: 4.0.0 (not sure about the exact built number - can’t determine it from the docker image)
• Browser/OS: Redash in docker on Ubuntu 17.10
• How did you install Redash: redash docker compose file from github pulling in redash:latest from docker hub

Looks like redash uses the source query parameter but as per https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html this also requires to provide a source_content_type parameter.

[alexdrans]

@RichardLitt Is this really a support issue?

If I go to the relevant line and add the appropriate content type for my query, i.e. change it to;

params = {"source": json.dumps(query_dict), "source_content_type": "application/json"}

then my queries execute as expected.

@chriswue Did you get around this?

[chriswue]

Opened support thread: https://discuss.redash.io/t/connecting-redash-4-to-elasticsearch-6/1412