Some string errors

[gregsilveira]

Zabbix Agent: zabbix_agentd (daemon) (Zabbix) 3.4.9
Python: 2.7.5

zabbix_server.log: 16375:20180717:120949.385 error reason for "hostname:elastizabbix[indices,_all.total.merges.total_time_in_millis]" changed: Item preprocessing step #1 failed: cannot calculate delta (speed per second) for value "" of type "string": cannot convert value to numeric type

zabbix_server.log: 16373:20180717:114756.713 item "hostname:elastizabbix[cluster,indices.shards.total]" became not supported: Value "" of type "string" is not suitable for value type "Numeric (unsigned)"

zabbix_server.log: 16373:20180717:114756.713 item "hostname:elastizabbix[indices,_all.total.flush.total]" became not supported: Item preprocessing step #1 failed: cannot calculate delta (speed per second) for value "" of type "string": cannot convert value to numeric type

zabbix_server.log: 16373:20180717:114756.713 item "hostname:elastizabbix[indices,_all.total.get.total]" became not supported: Item preprocessing step #1 failed: cannot calculate delta (speed per second) for value "" of type "string": cannot convert value to numeric type