# How to parse log and do look up where we have multiple values for a particular field

**URL:** <https://discuss.elastic.co/t/how-to-parse-log-and-do-look-up-where-we-have-multiple-values-for-a-particular-field/99377>\
**Category:** Logstash\
**Created:** [September 5, 2017, 6:58am UTC](https://discuss.elastic.co/t/how-to-parse-log-and-do-look-up-where-we-have-multiple-values-for-a-particular-field/99377 "2017-09-05T06:58:53Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![gchakkalakkal](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/gchakkalakkal/32/52203_2.png) [@gchakkalakkal](https://discuss.elastic.co/u/gchakkalakkal)\
**Post date:** [September 5, 2017, 6:58am UTC](https://discuss.elastic.co/t/how-to-parse-log-and-do-look-up-where-we-have-multiple-values-for-a-particular-field/99377/1 "2017-09-05T06:58:53Z")

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Sample log key:  
system":[{"systemCode":"abc"},{"systemCode":"def"},{"systemCode":"EOS"}]

Here we also need to do look of values mentioned in systemCode

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**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [September 6, 2017, 7:36pm UTC](https://discuss.elastic.co/t/how-to-parse-log-and-do-look-up-where-we-have-multiple-values-for-a-particular-field/99377/2 "2017-09-06T19:36:03Z")

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More details please. What's the expected result? What does the lookup table contain?

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<div class="post-metadata">

**Author:** ![gchakkalakkal](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/gchakkalakkal/32/52203_2.png) [@gchakkalakkal](https://discuss.elastic.co/u/gchakkalakkal)\
**Post date:** [September 8, 2017, 5:42am UTC](https://discuss.elastic.co/t/how-to-parse-log-and-do-look-up-where-we-have-multiple-values-for-a-particular-field/99377/3 "2017-09-08T05:42:55Z")

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Thank you was able to resolve using ruby filter.

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<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:** [October 6, 2017, 5:43am UTC](https://discuss.elastic.co/t/how-to-parse-log-and-do-look-up-where-we-have-multiple-values-for-a-particular-field/99377/4 "2017-10-06T05:43:37Z")

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