# How is Lucene instances determined?

**URL:** <https://discuss.elastic.co/t/how-is-lucene-instances-determined/81907>\
**Category:** Elasticsearch\
**Created:** [April 11, 2017, 4:25am UTC](https://discuss.elastic.co/t/how-is-lucene-instances-determined/81907 "2017-04-11T04:25:47Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![YuWatanabe](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yuwatanabe/32/13259_2.png) [@YuWatanabe](https://discuss.elastic.co/u/YuWatanabe)\
**Post date:** [April 11, 2017, 4:25am UTC](https://discuss.elastic.co/t/how-is-lucene-instances-determined/81907/1 "2017-04-11T04:25:47Z")

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Hello

I have a question with monitoring. How are number of Lucene instances determined? I only have 1 node but I see 3 in my case.

 ![](https://us1.discourse-cdn.com/elastic/original/3X/6/a/6a0214cb47e93f42c50281a0d600ef2bd411e58e.PNG)

My environment is elasticsearch 5.3.0 and basic information is below.

```
curl -XGET 127.0.0.1:9200/_cat/health?v
epoch timestamp cluster status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1491884683 13:24:43 elasticsearch yellow 1 1 84 84 0 0 84 0 - 50.0%
```

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<div class="post-metadata">

**Author:** ![weltenwort](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/weltenwort/32/53885_2.png) [@weltenwort](https://discuss.elastic.co/u/weltenwort)\
**Post date:** [April 11, 2017, 11:24am UTC](https://discuss.elastic.co/t/how-is-lucene-instances-determined/81907/2 "2017-04-11T11:24:10Z")

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Hi @YuWatanabe,

if you look at the legend of the three charts, you can see that they each displays a different set of memory metrics about the same index. Those are not meant to show three distinct indices.

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<div class="post-metadata">

**Author:** ![YuWatanabe](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/yuwatanabe/32/13259_2.png) [@YuWatanabe](https://discuss.elastic.co/u/YuWatanabe)\
**Post date:** [April 11, 2017, 8:18pm UTC](https://discuss.elastic.co/t/how-is-lucene-instances-determined/81907/3 "2017-04-11T20:18:21Z")

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@weltenwort

Your right . My apology for asking you a silly question and wasting your time.

All the legends are different.

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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:** [May 9, 2017, 8:20pm UTC](https://discuss.elastic.co/t/how-is-lucene-instances-determined/81907/4 "2017-05-09T20:20:35Z")

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