# Logstash array

**URL:** <https://discuss.elastic.co/t/logstash-array/159122>\
**Category:** Logstash\
**Created:** [December 3, 2018, 9:00am UTC](https://discuss.elastic.co/t/logstash-array/159122 "2018-12-03T09:00:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dinesh1](https://avatars.discourse-cdn.com/v4/letter/d/7bcc69/32.png) [@dinesh1](https://discuss.elastic.co/u/dinesh1)\
**Post date:** [December 3, 2018, 9:00am UTC](https://discuss.elastic.co/t/logstash-array/159122/1 "2018-12-03T09:00:22Z")

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How to add arrays or loops in the below filter....

filter {  
grok {  
match =\> { "source" =\> "/%{DATA:dir1}/%{DATA:dir2}/%{DATA:dir3}/%{DATA:mydata}/%{GREEDYDATA:end}" }  
}  
if [mydata] == "order"{  
mutate { add\_field =\> { "[@metadata][prefix]" =\> "order" } }  
}  
else if [mydata] == "merchant" {  
mutate { add\_field =\> { "[@metadata][prefix]" =\> "merchant" } }  
}  
else if [mydata] == "service" {  
mutate { add\_field =\> { "[@metadata][prefix]" =\> "service" } }  
}  
else if [mydata] == "eureka" {  
mutate { add\_field =\> { "[@metadata][prefix]" =\> "eureka" } }  
}  
else if [mydata] == "java" {  
mutate { add\_field =\> { "[@metadata][prefix]" =\> "java" } }  
}  
else if [mydata] == "nginx" {  
mutate { add\_field =\> { "[@metadata][prefix]" =\> "nginx" } }  
}  
else if [mydata] == "apache" {  
mutate { add\_field =\> { "[@metadata][prefix]" =\> "apache" } }  
}  
else if [mydata] == "messages" {  
mutate { add\_field =\> { "[@metadata][prefix]" =\> "messages" } }  
} else {  
mutate { add\_field =\> { "[@metadata][prefix]" =\> "%{[@metadata][beat]}" } }  
}  
}

output {  
elasticsearch {  
hosts =\> localhost  
index =\> "%{[@metadata][prefix]}-%{+YYYY.MM.dd}"  
}  
stdout {  
codec =\> rubydebug  
}  
}

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 31, 2018, 9:07am UTC](https://discuss.elastic.co/t/logstash-array/159122/2 "2018-12-31T09:07:48Z")

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