Hi, I am new to ELK. Trying to parse the date inside the multiline messages as timestamp. Let me know what config file to be used

[nkpaul (Nil)]

Unable to create index in ES from logstash

output {
stdout { codec => rubydebug }
elasticsearch {
hosts => ["127.0.0.1:9200"]
index => "MyLog-%{+YYYY.MM.dd}"
}
}

Please let me know what am I missing.