Elasticsearch version (bin/elasticsearch --version): OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
Version: 7.6.1, Build: default/docker/aa751e09be0a5072e8570670309b1f12348f023b/2020-02-29T00:15:25.529771Z, JVM: 13.0.2

Plugins installed: []

JVM version (java -version): openjdk version "13.0.2" 2020-01-14
OpenJDK Runtime Environment AdoptOpenJDK (build 13.0.2+8)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 13.0.2+8, mixed mode, sharing)

OS version (uname -a if on a Unix-like system): Linux ad9271944652 4.19.76-linuxkit #1 SMP Thu Oct 17 19:31:58 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Error is returned when attempting to create a filtered alias that uses a range, with a data_nanos field, using now, and a negative offset (such as now-7d)

This error does not appear when using date fields or when using positive offsets (such as now+7d)

Steps to reproduce:

1. Create index with date_nanos field

PUT date_source
{
  "mappings": {
    "properties": {
      "date": {
        "type": "date"
      },
      "date_nanos": {
        "type": "date_nanos"
      }
    }
  }
}

2. Create a filtered alias, filtering data_nanos field using negative offset (now-7d/d)

PUT date_source/_alias/date_nanos_alias
{
  "filter": {
   "range": {
      "date_nanos": {
        "gt": "now-7d/d"
      }
    }
  }
}

3. Receive an error:

{
  "error" : {
    "root_cause" : [
      {
        "type" : "illegal_argument_exception",
        "reason" : "failed to parse filter for alias [date_nanos_alias]"
      }
    ],
    "type" : "illegal_argument_exception",
    "reason" : "failed to parse filter for alias [date_nanos_alias]",
    "caused_by" : {
      "type" : "illegal_argument_exception",
      "reason" : "date[1969-12-25T23:59:59.999Z] is before the epoch in 1970 and cannot be stored in nanosecond resolution"
    }
  },
  "status" : 400
}