# Logstash Tempalte Definition - Index Creation Fails
**URL:** https://discuss.elastic.co/t/logstash-tempalte-definition-index-creation-fails/36299
**Category:** Elasticsearch
**Created:** [December 3, 2015, 3:12pm UTC](https://discuss.elastic.co/t/logstash-tempalte-definition-index-creation-fails/36299 "2015-12-03T15:12:56Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@inzanez](https://discuss.elastic.co/u/inzanez)
#### Post date: [December 3, 2015, 3:12pm UTC](https://discuss.elastic.co/t/logstash-tempalte-definition-index-creation-fails/36299/1 "2015-12-03T15:12:56Z")
Hello
I'm currently working with the latest version of ES, and just tried to create a custom template. I'm trying to define a 'standard' log source mapping template for my environment that I can use. So I would like to disable the dynamic mapping afterwards.
As a test, I just created a sample template very small, for example:
`{ "template" : "my_*", "mappings" : { "my_type" : { "my_field" : { "type" : "string" } } } }`
When I try to create an index however (I'm using Elastic-HQ for this), I get the following response:
`{"error":{"root_cause":[{"type":"mapper_parsing_exception","reason":"Root mapping definition has unsupported parameters: [my_field : {type=string}]"}],"type":"mapper_parsing_exception","reason":"Failed to parse mapping [my_type]: Root mapping definition has unsupported parameters: [my_field : {type=string}]","caused_by":{"type":"mapper_parsing_exception","reason":"Root mapping definition has unsupported parameters: [my_field : {type=string}]"}},"status":400}`
Similar reponse is logged when I try to let an index be created through ingestion with logstash. So I must be doing something wrong with the template I guess?
---
### Author:  [@jochen\_st](https://discuss.elastic.co/u/jochen_st)
#### Post date: [December 3, 2015, 3:43pm UTC](https://discuss.elastic.co/t/logstash-tempalte-definition-index-creation-fails/36299/2 "2015-12-03T15:43:17Z")
I think there may be a properties element missing:
```
{
"template" : "my_*",
"mappings" : {
"properties": {
"my_type" : {
"my_field" : { "type" : "string" }
}
}
}
}
```
---
### Author:  [@inzanez](https://discuss.elastic.co/u/inzanez)
#### Post date: [December 3, 2015, 3:47pm UTC](https://discuss.elastic.co/t/logstash-tempalte-definition-index-creation-fails/36299/3 "2015-12-03T15:47:02Z")
Yep, thanks! And it seems that the "type" is required too, as root mapping can't be...modified like that? I guess...
At least I managed it with:
```
{
"template" : "mytemplate*",
"mappings" : {
"syslog" : {
"properties": {
"@timestamp" : {
"type" : "date",
"format" : "strict_date_optional_time||epoch_millis"
},
"@version" : {
"type" : "string"
},
"ack_number" : {
....
```
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 5, 2017, 11:33pm UTC](https://discuss.elastic.co/t/logstash-tempalte-definition-index-creation-fails/36299/4 "2017-07-05T23:33:50Z")