Data Stream Backing Index Naming


I am using data stream to index my log records. In documentation, it is said that the backing index is named using the following convention:


but in my case, time segment does not appear.

I simply create an index template with index pattern : "my-data*", and my data stream name is also "my-data-stream". So I expect that my backing indices will be named like ".ds-my-data-stream-2022.03.16-000001" but I got ".ds-my-data-stream-000001". In youtube and other sources, that has happened in the same way but want the time segment as it is explained in documentation. Can you help me?

My mapping is like :

"_routing": {
"required": false
"dynamic": false,
"_source": {
"excludes": ,
"includes": ,
"enabled": true
"properties": {
"@timestamp": {
"type": "date"
"log_message": {
"type": "text"

for testing purpose.

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