Make logstash filter by name

I have a log file called "/var/log/commands.log" that I'm trying to separate into fields with logstash & grok. I've got it working. Now, I'm trying to make logstash only do this to the file "/var/log/commands.log" and not any input by doing "if name = commands.log" but something with the "if" statement seems wrong as it skips over it.

    path => "/var/log/commands.log"
    port => 5044
    filter {
    if [log][file][path] == "/var/log/commands.log" {
    match => { "message" => "*very long statement*"
    elasticsearch { hosts => ["localhost:9200"]}

If I remove the if statement it works and the fields are visible in kibana. I'm testing things locally. Does anyone know what's going on?

I think beats set [log][file][path], but a file input just sets [path]

Thank you SO MUCH! I have a follow up question if that's allowed, I'm also trying to make it read JSON logs. On another machine, I've got it working by adding the following to filebeat:

  - decode_json_fields:
      fields: ["message"]
      process_array: false
      max_depth: 1
      target: ""
      overwrite_keys: false
      add_error_key: true

Is it possible to achieve in logstash?

There is a json filter that can parse json.

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