# How ElasticSearch nodes syncrhonise in Cluster when nodes have different Index mappings **URL:** \ **Category:** Elasticsearch\ **Created:** [June 13, 2014, 9:25am UTC](https://discuss.elastic.co/t/how-elasticsearch-nodes-syncrhonise-in-cluster-when-nodes-have-different-index-mappings/18092 "2014-06-13T09:25:43Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Bhupali\_Kalmegh](https://avatars.discourse-cdn.com/v4/letter/b/4bbf92/32.png) [@Bhupali\_Kalmegh](https://discuss.elastic.co/u/Bhupali_Kalmegh)\ **Post date:** [June 13, 2014, 9:25am UTC](https://discuss.elastic.co/t/how-elasticsearch-nodes-syncrhonise-in-cluster-when-nodes-have-different-index-mappings/18092/1 "2014-06-13T09:25:43Z")
Hi , Kindly help me to understand the behaviour of ES nodes in Cluster when nodes have different Index mappings. I have 2 ES nodes both are currently having same Index versions. Now I want to upgrade both the nodes with the new index mapping. Scenario 1 : Without keeping the node down, start mapping changes on Node1. During the mapping changes, if any request comes & suppose it is handled by Node1 only. Now, How & when this Node#1 & Node#2 will synchronise? Scenario 2 : Without keeping the node down, start mapping changes on Node1. During the mapping changes, if any request comes & suppose it is handled by Node2. Now, How & when this Node#1 & Node#2 will synchronise? Want to know, whose data will be available after the complete mappings completion on both nodes. -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/848a1c4e-a0a1-4a65-80d9-d184bda6b3ef%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/848a1c4e-a0a1-4a65-80d9-d184bda6b3ef%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Luis\_Garcia\_Acosta](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/luis_garcia_acosta/32/1266_2.png) [@Luis\_Garcia\_Acosta](https://discuss.elastic.co/u/Luis_Garcia_Acosta)\ **Post date:** [June 13, 2014, 9:41am UTC](https://discuss.elastic.co/t/how-elasticsearch-nodes-syncrhonise-in-cluster-when-nodes-have-different-index-mappings/18092/2 "2014-06-13T09:41:51Z")
Mapping is applied at cluster level, and existing index wont get the new mapping. You will need to reindex your data, aka create a new index after you apply the new mapping -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/4a02b6e5-71e9-47bf-a334-379a666ed2bd%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/4a02b6e5-71e9-47bf-a334-379a666ed2bd%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Bhupali\_Kalmegh](https://avatars.discourse-cdn.com/v4/letter/b/4bbf92/32.png) [@Bhupali\_Kalmegh](https://discuss.elastic.co/u/Bhupali_Kalmegh)\ **Post date:** [June 13, 2014, 9:47am UTC](https://discuss.elastic.co/t/how-elasticsearch-nodes-syncrhonise-in-cluster-when-nodes-have-different-index-mappings/18092/3 "2014-06-13T09:47:27Z")
Yes, I am creating new index and then migrating the data from older index to new index. So, when this migration is going on, if any request comes, then what would be the behaviour? On Friday, June 13, 2014 3:11:52 PM UTC+5:30, Luis García Acosta wrote: > Mapping is applied at cluster level, and existing index wont get the new > mapping. You will need to reindex your data, aka create a new index after > you apply the new mapping -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/c903f779-1b3d-42fd-8d49-4157465c9eac%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/c903f779-1b3d-42fd-8d49-4157465c9eac%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**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:** [June 13, 2014, 11:03am UTC](https://discuss.elastic.co/t/how-elasticsearch-nodes-syncrhonise-in-cluster-when-nodes-have-different-index-mappings/18092/4 "2014-06-13T11:03:03Z")
That depends on how you do the migration, it's not something ES handles automatically, you need to do it yourself. Regards, Mark Walkom Infrastructure Engineer Campaign Monitor email: [markw@campaignmonitor.com](mailto:markw@campaignmonitor.com) web: [www.campaignmonitor.com](http://www.campaignmonitor.com) On 13 June 2014 19:47, Bhupali Kalmegh [bhupali123@gmail.com](mailto:bhupali123@gmail.com) wrote: > Yes, I am creating new index and then migrating the data from older index > to new index. So, when this migration is going on, if any request comes, > then what would be the behaviour? > > On Friday, June 13, 2014 3:11:52 PM UTC+5:30, Luis García Acosta wrote: > > > Mapping is applied at cluster level, and existing index wont get the new > > mapping. You will need to reindex your data, aka create a new index after > > you apply the new mapping > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/c903f779-1b3d-42fd-8d49-4157465c9eac%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/c903f779-1b3d-42fd-8d49-4157465c9eac%40googlegroups.com) > [https://groups.google.com/d/msgid/elasticsearch/c903f779-1b3d-42fd-8d49-4157465c9eac%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/c903f779-1b3d-42fd-8d49-4157465c9eac%40googlegroups.com?utm_medium=email&utm_source=footer) > . > > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAEM624btWzhjYs-RsFSU%3DTN1JUmEDdDfabpNU-0Yd2%2BSP3J%2BiQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAEM624btWzhjYs-RsFSU%3DTN1JUmEDdDfabpNU-0Yd2%2BSP3J%2BiQ%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 1:22am UTC](https://discuss.elastic.co/t/how-elasticsearch-nodes-syncrhonise-in-cluster-when-nodes-have-different-index-mappings/18092/5 "2017-07-06T01:22:45Z")