Logstash Filter - Elasticserach Query

Good afternoon,

I am working on a Logstash filter and am in need of assitance.

Basically, I have two indexes; one is a list of known malware domains (domainlist) and another is an index of DNS queries fed by Packetbeat.

As the DNS logs hit Logstash I want LS to query ES and see if the query matches any domains listed in the "domainlist" index. If is does, I want it to add the tag "malware."

Here is what I have so far. Now, this filter simply adds the tag to all "DNS" types. How do I say "if ES query returns "true", add tag ...."

if [type] == "dns" {
elasticsearch {
hosts => "elasticsearch:9200"
index => "domainlist"
query => "domain:%{resource}"
add_tag => ["malware","malwaredomainlist.com"]

Thanks in advance!

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