# How to develop a plugin (ingest node) to convert a field from Lambert II to WGS84 (geographic coordination system) and test it?
**URL:** https://discuss.elastic.co/t/how-to-develop-a-plugin-ingest-node-to-convert-a-field-from-lambert-ii-to-wgs84-geographic-coordination-system-and-test-it/115037
**Category:** Elasticsearch
**Created:** [January 11, 2018, 8:32am UTC](https://discuss.elastic.co/t/how-to-develop-a-plugin-ingest-node-to-convert-a-field-from-lambert-ii-to-wgs84-geographic-coordination-system-and-test-it/115037 "2018-01-11T08:32:09Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@chrigui94](https://discuss.elastic.co/u/chrigui94)
#### Post date: [January 11, 2018, 8:32am UTC](https://discuss.elastic.co/t/how-to-develop-a-plugin-ingest-node-to-convert-a-field-from-lambert-ii-to-wgs84-geographic-coordination-system-and-test-it/115037/1 "2018-01-11T08:32:09Z")
I have an Index contains (Latitude, longitude ) of a position in Lambert II and I need to convert these coordinates to (Lat, long) in WGS84. I have the java code how to change from Lambert II to WGS84 and I need the steps to develop a plugin and use it for my index ?
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### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [January 11, 2018, 8:41am UTC](https://discuss.elastic.co/t/how-to-develop-a-plugin-ingest-node-to-convert-a-field-from-lambert-ii-to-wgs84-geographic-coordination-system-and-test-it/115037/2 "2018-01-11T08:41:56Z")
That's a too wide question and I'm afraid we can't really help.
But some resources:
- [https://www.elastic.co/guide/en/elasticsearch/plugins/current/plugin-authors.html](https://www.elastic.co/guide/en/elasticsearch/plugins/current/plugin-authors.html)
- [https://www.elastic.co/blog/writing-your-own-ingest-processor-for-elasticsearch](https://www.elastic.co/blog/writing-your-own-ingest-processor-for-elasticsearch)
Also, may be you should not write a plugin for that but do the conversion on the client side instead?
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### Author:  [@chrigui94](https://discuss.elastic.co/u/chrigui94)
#### Post date: [January 16, 2018, 3:07pm UTC](https://discuss.elastic.co/t/how-to-develop-a-plugin-ingest-node-to-convert-a-field-from-lambert-ii-to-wgs84-geographic-coordination-system-and-test-it/115037/3 "2018-01-16T15:07:24Z")
I developed the plugin using the same hierarchy of the "ingest-attachement" plugin but I don't know how to test if my plugin is working correctly or no, I have a csv file contains (lat, longitude) in lambert II but I can't see the changement in my index... how to verify that my plugin is working correctly ? and how to use it in kibana dev tools ?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 13, 2018, 3:07pm UTC](https://discuss.elastic.co/t/how-to-develop-a-plugin-ingest-node-to-convert-a-field-from-lambert-ii-to-wgs84-geographic-coordination-system-and-test-it/115037/4 "2018-02-13T15:07:31Z")
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