Elasticsearch filter plugin for data enrichment

i have indexed 2 tables from mysql to elasticsearch:
user_index:
{
id : 1,
name : user_name,
hobbies : 1,2
}

hobbies_index:
{
id : 1,
name : hobby1
}
id : 2,
name : hobby2
}

i want to enrich my document as users being parent and hobbies being its child using elasticsearch filter plugin for logstash and get the output like this:

{
id : 1,
name : user_name,
hobbies : 1,2
hobbies_name : hobby1, hobby2
}

My config file

input {
elasticsearch {
hosts => "hostname"  
index => "user_index*"
query => '{ "query": { "match_all": { } } }'
scroll => "5m"
docinfo => true
}
}

filter {
elasticsearch {
hosts => "hostname"
index => "hobbies_index"

query => "id:%{id}"
fields => { "name" => "hobbies_name"  }
}  
}
output {
elasticsearch {
  hosts => ["hostname"]
  index => "test"
}

How do i correctly do this? please help i'm a newbie.