# Blocker for Upgrade to 2.x

**URL:** <https://discuss.elastic.co/t/blocker-for-upgrade-to-2-x/76720>\
**Category:** Elasticsearch\
**Created:** [February 28, 2017, 5:07am UTC](https://discuss.elastic.co/t/blocker-for-upgrade-to-2-x/76720 "2017-02-28T05:07:39Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Balamurali](https://avatars.discourse-cdn.com/v4/letter/b/90db22/32.png) [@Balamurali](https://discuss.elastic.co/u/Balamurali)\
**Post date:** [February 28, 2017, 5:07am UTC](https://discuss.elastic.co/t/blocker-for-upgrade-to-2-x/76720/1 "2017-02-28T05:07:39Z")

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Hi all,

we are using **ES 1.3.7** version for huge data's.

For upgrading to 2.x, we have big blocker (i.e) more than thousands **Mapping conflicts** in indices .

we need to upgrade because facing more bugs's in ES 1.x

we facing difficulties to overcome this blocker ,Can any one suggest how to resolve it!

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [February 28, 2017, 5:44am UTC](https://discuss.elastic.co/t/blocker-for-upgrade-to-2-x/76720/2 "2017-02-28T05:44:40Z")

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You will need to reindex the data to fix those conflicts.

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<div class="post-metadata">

**Author:** ![Balamurali](https://avatars.discourse-cdn.com/v4/letter/b/90db22/32.png) [@Balamurali](https://discuss.elastic.co/u/Balamurali)\
**Post date:** [February 28, 2017, 5:58am UTC](https://discuss.elastic.co/t/blocker-for-upgrade-to-2-x/76720/3 "2017-02-28T05:58:22Z")

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thanks @warkolm ,Reindex leads to data loss right?

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [February 28, 2017, 7:57am UTC](https://discuss.elastic.co/t/blocker-for-upgrade-to-2-x/76720/4 "2017-02-28T07:57:16Z")

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Nope.

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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 28, 2017, 7:57am UTC](https://discuss.elastic.co/t/blocker-for-upgrade-to-2-x/76720/5 "2017-03-28T07:57:17Z")

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