Thank you for reply, but in my case problem was '/' in the end of hosts: ["http://10.0.10.209:9200/"]; so current configuration is following:
filebeat.prospectors:
- input_type: log
paths:
- 'C:\Projects\Utils\FileBeats\sample\log.json'
output.elasticsearch:
hosts: ["http://10.0.10.209:9200"]
template.name: filebeat
template.path: filebeat.template.json