# Documents size increased after increasing the heap on ES nodes **URL:** \ **Category:** Elasticsearch\ **Created:** [April 8, 2016, 5:58am UTC](https://discuss.elastic.co/t/documents-size-increased-after-increasing-the-heap-on-es-nodes/46764 "2016-04-08T05:58:29Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![ApoorvaLad](https://avatars.discourse-cdn.com/v4/letter/a/7ba0ec/32.png) [@ApoorvaLad](https://discuss.elastic.co/u/ApoorvaLad)\ **Post date:** [April 8, 2016, 5:58am UTC](https://discuss.elastic.co/t/documents-size-increased-after-increasing-the-heap-on-es-nodes/46764/1 "2016-04-08T05:58:29Z")
I have an ES cluster with 5 nodes. 1 acting as client node, 1 acting as master node and 3 as data nodes. I was using the default 1GB heap for each of these nodes. However, after getting Out Of Memory Exception, I increased the Heap to 16GB (I have machines upto 64GB RAM). After this change in configuration, I have seen an increase in the documents (Number of documents and Total index size). The inflow of data in both these scenarios has been constant. Is there a possibility, that due to low memory, ES was not indexing all my data initially? Thanks in Advance. 🙂 ---
**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:** [April 9, 2016, 7:31am UTC](https://discuss.elastic.co/t/documents-size-increased-after-increasing-the-heap-on-es-nodes/46764/2 "2016-04-09T07:31:22Z")
> [@ApoorvaLad](#): > > Is there a possibility, that due to low memory, ES was not indexing all my data initially? No. It may have been slow but documents cannot simply "appear". > [@ApoorvaLad](#): > > 1 acting as master node That's not really a good idea, it can lead to split brain. ---
**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, 11:00pm UTC](https://discuss.elastic.co/t/documents-size-increased-after-increasing-the-heap-on-es-nodes/46764/3 "2017-07-05T23:00:59Z")