# Doubts regarding ES

**URL:** <https://discuss.elastic.co/t/doubts-regarding-es/119447>\
**Category:** Elasticsearch\
**Created:** [February 12, 2018, 10:09am UTC](https://discuss.elastic.co/t/doubts-regarding-es/119447 "2018-02-12T10:09:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![madhur\_yadav](https://avatars.discourse-cdn.com/v4/letter/m/e56c9b/32.png) [@madhur\_yadav](https://discuss.elastic.co/u/madhur_yadav)\
**Post date:** [February 12, 2018, 10:09am UTC](https://discuss.elastic.co/t/doubts-regarding-es/119447/1 "2018-02-12T10:09:43Z")

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Hi there, 🙂

I have a product (version 1) using ES. This product has been deployed on my customers.

Now for the version 2 of my product, I'm making certain changes regarding ES and I have some doubts.  
ES version - 5.6.2

1. If new fields are defined and older ones are modified or deleted, will it effect the existing data on ES present in version 1 during migration to version 2.

2. If I convert my cluster from single node to multi-node setup, will it effect the existing data on ES present in version 1 during migration to version 2.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 12, 2018, 10:09am UTC](https://discuss.elastic.co/t/doubts-regarding-es/119447/2 "2018-03-12T10:09:48Z")

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Closed on March 12, 2018, 10:09am UTC

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