[Feature]GeoIP datasource integration in GeoIP processor

[heemin32]

Description

This document contains implementation detail on GeoIP datasource integration in GeoIP processor as part of #5856

Tasks

Tasks are listed here to track a progress in the implementation. One PR can cover multiple tasks if code change is small.

GeoIP processor

• Add new parameter to accept datasource
• Query datasource index during ingestion

User scenarios

Create/Update of GeoIP data source

1. Customer makes a call to create GeoIP processor using the data source.
   1. The call succeed only when GeoIP data source state is available.
2. The GeoIP processor query the index to enrich location data.
   1. Convert data only when the GeoIP data is in valid state
      1. “state” is available
      2. Current time is before “expire_after“

PUT _ingest/pipeline/geoip
{
  "processors" : [
    {
      "geoip" : {
        "field" : "ip",
        "target_field" : "location",
        "datasource" : "my-datasource"
      }
    }
  ]
}