Field aliases in search results

[andreas123 (Andreas)]

Hey,

we have different suppliers for data that is imported into elastic. The suppliers use different field names, but some of them use the same type of data.
Example:
Supplier A:
last_seen: 2020_02_03
IP: 10.10.10.10

Supplier B:
date: 2020_02_03
ip_address: 192.168.0.1

We have one index for each supplier. To simplify the search and to achieve some harmonisation I created alias fields.
index A:
date_alias_field => last_seen
ip_alias_field => IP

index B:
date_alias_field => ip_address
ip_alias_field => ip_address

The search works very well:

GET /_search
{
  "query": {
    "query_string": {
      "query": "192.168.0.1",
      "default_field": "ip_alias_field"
    }
  }
}

Now I want to use the alias fields, in this case the field "date_alias_field" for further steps in our process. But these are not output at all (because not part of "_source"). Is there a solution to get them?

ps: we use "query_string" because we have multiple alias fields and use wildcards (*), f.e. "default_field": "ip_alias*"

Cheers
Andreas

[mayya (Mayya Sharipova)]

You can use a new fields API that accepts alias fields as well:

{
  "query": <your_query>,
  "fields": ["date_alias_field", "ip_alias_field"]
}