# Will there be performance issue in Index templates on using " \* "

**URL:** <https://discuss.elastic.co/t/will-there-be-performance-issue-in-index-templates-on-using/16135>\
**Category:** Elasticsearch\
**Created:** [March 4, 2014, 9:53am UTC](https://discuss.elastic.co/t/will-there-be-performance-issue-in-index-templates-on-using/16135 "2014-03-04T09:53:17Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![golchhamohit](https://avatars.discourse-cdn.com/v4/letter/g/e19adc/32.png) [@golchhamohit](https://discuss.elastic.co/u/golchhamohit)\
**Post date:** [March 4, 2014, 9:53am UTC](https://discuss.elastic.co/t/will-there-be-performance-issue-in-index-templates-on-using/16135/1 "2014-03-04T09:53:17Z")

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Hi all,

```
      As there is no support of regex in Index templates as of now, in 

```

case if I am applying the simple matching pattern as "\*"  
which will match all index, mapping will be created for indices which  
might not have that field in the future. Will there be any  
performance issue in those indices which have mapping but no data ? Or is  
it just as to my understanding a empty table(mapping)  
with just schema defined in SQL ?

Thanks & Regards,  
Mohit Golchha

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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:** [July 6, 2017, 1:45am UTC](https://discuss.elastic.co/t/will-there-be-performance-issue-in-index-templates-on-using/16135/2 "2017-07-06T01:45:53Z")

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