Fix _source query in integration test.

[urso]

Source queries must be typeless most recently. Update query to <index>/_source/<id> in integration test.

[kaiyan-sheng]

waiting to see ci go green, thank you so much for fixing it!

[andrewkroh]

LGTM assuming the libbeat tests go green now. 🍏

[kaiyan-sheng]

Seems like two more places will need to be changed:

--- FAIL: TestIndex (0.02s)
    api_integration_test.go:51: Index() returns error: Elasticsearch response: {"error":"Incorrect HTTP method for uri [/beats-test-index-11477/1?refresh=true] and method [PUT], allowed: [POST]","status":405}: 405 Method Not Allowed: {"error":"Incorrect HTTP method for uri [/beats-test-index-11477/1?refresh=true] and method [PUT], allowed: [POST]","status":405}
--- FAIL: TestIngest (0.18s)
    api_integration_test.go:145: Ingest() returns error: Elasticsearch response: {"error":"Incorrect HTTP method for uri [/beats-test-ingest-11477/1?pipeline=beats-test-pipeline-11477&refresh=true] and method [PUT], allowed: [POST]","status":405}: 405 Method Not Allowed: {"error":"Incorrect HTTP method for uri [/beats-test-ingest-11477/1?pipeline=beats-test-pipeline-11477&refresh=true] and method [PUT], allowed: [POST]","status":405}
FAIL

[urso]

This is same location as before. But something else seems to have changed in ES as well. Looks like I'm going down a rabbid hole here. Just have some patience and CI will be green again :)

[cwurm]

I think it's failing because only the get APIs have been made typeless in Elasticsearch (elastic/elasticsearch#46931), but not the ingest APIs (still has {type} here).

[ph]

@cwurm I think you are correct, after looking at the code seems we have a divergence between the ingest and the GET side.

[urso]

@cwurm Thanks, that seems to be the issue. I update the source query. Test runs through locally. Let's see what CI says.