Syslog Cisco "illegal_argument_exception"

[DorianL (LAGILLE)]

Hello,

I want to export logs from my cisco router via logstash.
Here is the filter that I put in place and which brings out the logs correctly:

the filter

###########################
filter {

  grok {
    patterns_dir => [ "/etc/logstash/patterns" ]
    match => [
      "message",
      "%{HOSTNAME:host.name}: %{CISCOTIMESTAMPTZ:log_date}: %%{CISCO_REASON:facility}-%{INT:severity_level}-%{CISCO_REASON:facility_mnemonic}: %{GREEDYDATA:message}"
    ]
    overwrite => [ "message" ]
    add_tag => [ "cisco" ]
    remove_field => [ "@version" ]
  }

  if "cisco" in [tags] {
    mutate {
      gsub => [
        "severity_level", "0", "0 - Emergency",
        "severity_level", "1", "1 - Alert",
        "severity_level", "2", "2 - Critical",
        "severity_level", "3", "3 - Error",
        "severity_level", "4", "4 - Warning",
        "severity_level", "5", "5 - Notification",
        "severity_level", "6", "6 - Information"
      ]
    }
  }
}
###########################

the output

###########################
{
    "facility_mnemonic" => "BAD_PACK_LEN",
             "facility" => "SSH",
              "message" => "Bad packet length -440567870",
       "severity_level" => "3 - Error",
            "host.name" => "RBB",
             "log_date" => "Sep 30 18:02:29.452",
           "@timestamp" => 2019-10-02T09:26:40.930Z,
                 "host" => "LOGSTASH",
                 "tags" => [
        [0] "cisco"
    ],
                 "type" => "syslog-cisco"
}
###########################

I have the following error when I export my logs:

[WARN ] 2019-10-02 12:06:52.184 [[main]>worker3] elasticsearch - Could not index event to Elasticsearch. {:status=>400, :action=>["index", {:_id=>nil, :_index=>"network-2019.10.02", :_type=>"syslog-cisco", :routing=>nil}, #<LogStash::Event:0x137742b0>], :response=>{"index"=>{"_index"=>"network-2019.10.02", "_type"=>"syslog-cisco", "_id"=>"c-7vi20BviaHAKaazhfz", "status"=>400, "error"=>{"type"=>"illegal_argument_exception", "reason"=>"mapper [host] of different type, current_type [keyword], merged_type [ObjectMapper]"}}}}

could you help me ?