Apply filters

good afternoon. Recently I started to get acquainted with ELK and aot what is my problem:
I use such a filter

filter {
 if [type] == "syslog" {
    grok {
        match => { "message" => "<%{POSINT:syslog_pri}>%{SYSLOGTIMESTAMP:syslog_timestamp} %{SYSLOGHOST:syslog_hostname} %{DATA:syslog_program}(?:\[%{POSINT:syslog_pid}\])?: %{GREEDYDATA:syslog_message}" }
  date {
        match => [ "timestamp" , "dd/MMM/YYYY:HH:mm:ss Z" ]

I need to filter the log not by the time it was shipped to ELK, but by the actual event of the log entry. How can I achieve this?

does no one really know how to do this?

You are extracting the timestamp from the log message into [syslog_timestamp], but using the date filter to parse a different field. Parse the [syslog_timestamp].

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