elastic stack : i need set Time Filter field name with another field - elasticsearch

Question

i need read messages(content is logs) from rabbitMq by logstash and then send that to elasticsearch for make visualize monitoring in kibana. so i wrote input for read from rabbitmq in logstash like this:
input {
rabbitmq {
queue => "testLogstash"
host => "localhost"
}
}
and i wrote output configuration for store in elasticsearch in logstash like this:
output {
elasticsearch{
hosts => "http://localhost:9200"
index => "d13-%{+YYYY.MM.dd}"
}
}
Both of them are placed in myConf.conf
In the content of each message, there is a Json that contains the fields like this:
{
"mDate":"MMMM dd YYYY, HH:mm:ss.SSS"
"name":"test name"
}
But there are two problems. First, there is no date field in the field of creating a new index(Time Filter field name). Second, I use the same timestamp as the default #timestamp, this field will not be displayed in the build type of graphs. I think the reason for this is because of the data type of the field. The field is of type date, but the string is considered.
i try to convert value of field to date by mutate in logstash config like this:
filter {
mutate {
convert => { "mdate" => "date" }
}
}
Now, two questions arise:
1- Is this the problem? If yes What is the right solution to fix it?
2- My main need is to use the time when messages are entered in the queue, not when Logstash takes them. What is the best solution?

Answer 1

If you don't specify a value for #timestamp, you should get the current system time when elasticsearch indexes the document. With that, you should be able to see items in kibana.
If I understand you correctly, you'd rather use you mDate field for #timestamp. For this, use the date{} filter in logstash.