Logstash filter to create a subfield based on specific text in a log message

I've been working on a Logstash configuration where I'm trying to create a subfield within the 'message1' field based on a specific text pattern ('Started'). Here's a snippet of my current Logstash filter:

filter {
  grok {
    pattern_definitions => {
      "Extract_log_line" => "%{TIMESTAMP_ISO8601:timestamp} \| %{LOGLEVEL:log_level} \| \[%{DATA:thread}\] --- %{NUMBER:process_id} \| %{DATA:class} \| \| %{GREEDYDATA:message1}(\\r|\\n)?"
      "Extract_routes_started" => ".*Started %{DATA:routes_started} .*"
    match => {
      "message" => [
    add_field => {
      "[message1][routes_started]" => "%{routes_started}"
  mutate {
    remove_field => ["@timestamp", "@version"]

Unfortunately, this doesn't seem to be working as expected "_grokparsefailure" I'm trying to detect the text 'Started' within the 'message1' field and create a subfield 'routes_started' based on the text that follows it. Could anyone assist in identifying what might be incorrect in my Logstash configuration or suggest a better approach to achieve this?

You never reference the Extract_routes_started pattern that you defined, so [routes_started] will never exist. I can't say why the Extract_log_line pattern does not match without seeing a sample of [message].

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