Description
See #44914 (comment)
Something changed recently in ES, triggering a slew of test failures (elastic/kibana#52470, elastic/kibana#52471, elastic/kibana#52476).
The culprit seems to be using bucket_script aggregations somewhere under a nested aggregation. In this scenario, the bucket_script aggregation doesn't seem to ever run, as the response does not contain the data.
(Partial copy-paste from the comment linked above)
See this example here: https://gist.github.com/chrisronline/836dbbdb594d5848538e412236f32147
For 7.5 and below, the output is:
{
"aggregations" : {
"date_histo" : {
"buckets" : [
{
"in_nested" : {
"types" : {
"buckets" : [
{
"bs_value" : {
"value" : 1.0
}
}
]
}
},
"high_level_bs_value" : {
"value" : 0.0
}
}
]
}
}
}
For 7.6 and above, the output is:
{
"aggregations" : {
"date_histo" : {
"buckets" : [
{
"high_level_bs_value" : {
"value" : 0.0
}
}
]
}
}
}
Luckily, we have good test coverage for this, but this needs to be a blocker for 7.6
I've pinged @polyfractal about this and he is currently investigating. It sounds like this is also affecting other aggregation types too.
cc @elastic/stack-monitoring