[bug] GET /api/user/current fails with 500

[jakubgs]

Work Environment

Question	Answer
OS version (server)	Ubuntu 20.04
Cortex version / git hash	3.0.1-1
Package Type	Binary
ElasticSearch	7.8.0

Problem Description

I started Cortex with a very standard config based on the provided one in which essentially I just changed the url and index. After creating the cortex_4 index manually I tried opening the Web UI but all I got were failed GET /api/user/current requests receiving 500 errors:

{
  "type": "com.fasterxml.jackson.databind.exc.MismatchedInputException",
  "message": "Cannot deserialize instance of `long` out of START_OBJECT token\n at [Source: (String)\"{\"took\":6,\"timed_out\":false,\"_shards\":{\"total\":3,\"successful\":3,\"skipped\":0,\"failed\":0},\"hits\":{\"total\":{\"value\":0,\"relation\":\"eq\"},\"max_score\":null,\"hits\":[]}}\"; line: 1, column: 105] (through reference chain: com.sksamuel.elastic4s.http.search.SearchResponse[\"hits\"]->com.sksamuel.elastic4s.http.search.SearchHits[\"total\"])"
}

Which shows up in logs as:

[info] o.t.c.s.ErrorHandler [|] GET /api/user/current returned 500
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `long` out of START_OBJECT token
 at [Source: (String)"{"took":5,"timed_out":false,"_shards":{"total":3,"successful":3,"skipped":0,"failed":0},"hits":{"total":{"value":0,"relation":"eq"},"max_score":null,"hits":[]}}"; line: 1, column: 105] (through reference chain: com.sksamuel.elastic4s.http.search.SearchResponse["hits"]->com.sksamuel.elastic4s.http.search.SearchHits["total"])
        at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63)
        at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1342)
        at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1138)
        at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1092)
        at com.fasterxml.jackson.databind.deser.std.NumberDeserializers$LongDeserializer._parseLong(NumberDeserializers.java:593)
        at com.fasterxml.jackson.databind.deser.std.NumberDeserializers$LongDeserializer.deserialize(NumberDeserializers.java:557)
        at com.fasterxml.jackson.databind.deser.std.NumberDeserializers$LongDeserializer.deserialize(NumberDeserializers.java:535)
        at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:530)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeWithErrorWrapping(BeanDeserializer.java:528)
        at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:417)

Which I have no idea what I'm supposed to do about.

[To-om]

You must not create the index manually. This the reason of this problem.

[jakubgs]

The index was not being created because 3.0.1-1 does not support ElasticSearch 7.8.0.

I was doubly confused because 3.1.0-RC1 which is supposed to support ES 7 was also not creating it, but that was a bug.