# Major changes between Elasticsearch 1.7.x and 2.3.x **URL:** \ **Category:** Elasticsearch\ **Created:** [May 9, 2016, 1:29pm UTC](https://discuss.elastic.co/t/major-changes-between-elasticsearch-1-7-x-and-2-3-x/49551 "2016-05-09T13:29:32Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![owjprice](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/owjprice/32/9670_2.png) [@owjprice](https://discuss.elastic.co/u/owjprice)\ **Post date:** [May 9, 2016, 1:29pm UTC](https://discuss.elastic.co/t/major-changes-between-elasticsearch-1-7-x-and-2-3-x/49551/1 "2016-05-09T13:29:32Z")
I am working on a team that is evaluating the upgrade from 1.7.x to 2.3.x. Other than stepping through the release notes is there any other way to pinpoint the largest changes/improvements between these versions? Specifically I am looking for what are the pros/cons of upgrading. We have a very large set of indexes each with millions of records. ---
**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:** [May 10, 2016, 1:13am UTC](https://discuss.elastic.co/t/major-changes-between-elasticsearch-1-7-x-and-2-3-x/49551/2 "2016-05-10T01:13:25Z")
There's no single page, no. What is your use case? ---
**Author:** ![mainec](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mainec/32/5557_2.png) [@mainec](https://discuss.elastic.co/u/mainec)\ **Post date:** [May 10, 2016, 8:52am UTC](https://discuss.elastic.co/t/major-changes-between-elasticsearch-1-7-x-and-2-3-x/49551/3 "2016-05-10T08:52:42Z")
There's no page I'm aware of that lists largest new features by version. However there's two pages that might help you nonetheless: [https://www.elastic.co/guide/en/elasticsearch/resiliency/current/index.html](https://www.elastic.co/guide/en/elasticsearch/resiliency/current/index.html) gives you an overview of what happened between your version and 2.3 wrt. stability/resiliency. For identifying things that will break on upgrade there is [https://www.elastic.co/guide/en/elasticsearch/reference/current/breaking-changes.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/breaking-changes.html) ---
**Author:** ![owjprice](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/owjprice/32/9670_2.png) [@owjprice](https://discuss.elastic.co/u/owjprice)\ **Post date:** [May 10, 2016, 12:24pm UTC](https://discuss.elastic.co/t/major-changes-between-elasticsearch-1-7-x-and-2-3-x/49551/4 "2016-05-10T12:24:31Z")
Nope...no single page. I have been stepping through all of the release notes from versions put out after 1.7.x but it has been quite the task. ---
**Author:** ![owjprice](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/owjprice/32/9670_2.png) [@owjprice](https://discuss.elastic.co/u/owjprice)\ **Post date:** [May 10, 2016, 12:25pm UTC](https://discuss.elastic.co/t/major-changes-between-elasticsearch-1-7-x-and-2-3-x/49551/5 "2016-05-10T12:25:53Z")
Thanks for the resources. I have been stepping through the release notes and the breaking changes pages for all the versions leading up to the current version. It would be nice if there was a feature matrix somewhere that would show features and what version they are available in as a high level way of looking at it. ---
**Author:** ![NouhaPhD](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nouhaphd/32/9566_2.png) [@NouhaPhD](https://discuss.elastic.co/u/NouhaPhD)\ **Post date:** [May 10, 2016, 1:05pm UTC](https://discuss.elastic.co/t/major-changes-between-elasticsearch-1-7-x-and-2-3-x/49551/6 "2016-05-10T13:05:50Z")
Hello, It would be great if it's possible ! I'am evaluating the upgrade form 1.7.5 to 2.3.2, for millions of documents too. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 5, 2017, 10:52pm UTC](https://discuss.elastic.co/t/major-changes-between-elasticsearch-1-7-x-and-2-3-x/49551/7 "2017-07-05T22:52:46Z")