Kibana complain about 'The indices which match this index pattern don't contain any time fields.' when try to read rsyslog from elasticsearch

Issue

• After the configuration of rsyslog on Red Hat Openstack Platform 16.1 to send the log to elasticsearch server the indexes seems created in the right way.
• But when configure Kibana to use them (creating an index pattern) you can get the message 'The indices which match this index pattern don't contain any time fields.'
• Also, Grafana configuring the Elasticsearch datasource give a similar message: 'No date field named @timestamp found'.