The index-pattern does not work on the 7.13.3 but 7.10 works well

I used the following json to create the index-pattern, the index-pattern is empty but the name. no fields in it.
{
"attributes": {
"fields": "[{"name":"@timestamp","type":"date","esTypes":["date"],"count":0,"scripted":false,"searchable":true,"aggregatable":true,"readFromDocValues":true}]",
"timeFieldName": "@timestamp",
"title": "alarms_index-*"
},
"migrationVersion": {
"index-pattern": "7.8.0"
},
"references":
}

thanks

Duplicate post of Related to Creating pattern issue from 7.11.0

You should be able to omit the fields - I don't believe they are cached on the index-pattern anymore.