[BUG] Memory leak in logstash-oss-with-opensearch-output-plugin 8.9

[NamanChandra1]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://hub.docker.com/r/opensearchproject/logstash-oss-with-opensearch-output-plugin'
2. docker pull opensearchproject/logstash-oss-with-opensearch-output-plugin:latest
3. Configuration:

logstash.conf: |-
    input {
      kafka {
        consumer_threads => 5
        bootstrap_servers => "kafka:9092"
        decorate_events => basic
        group_id => "logstash"
        topics => ["kube-logs"]
        codec => "json"
      }
      http {
        port => 8000
        type => "healthcheck"
      }
    }
    filter {
      mutate {
        remove_field => ["[log][file][path]", "[log][offset]"]
      }

      if [kubernetes][labels][role] {
        mutate {
          add_field => { "kubernetes.annotations.role" => "%{[kubernetes][labels][role]}" }
        }
      }
      mutate {
        add_field => { "partition" => "%{[@metadata][kafka][partition]}" }
        remove_field => [ "host","event" ]
        add_field => { "index_label" => "%{[kubernetes][container][name]}"}
        add_field => { "kubernetes.pod_name" => "%{[kubernetes][pod][name]}"}
        add_field => { "kubernetes.container_name" => "%{[kubernetes][container][name]}"}
        add_field => { "kubernetes.pod_id" => "%{[kubernetes][pod][uid]}"}
        add_field => { "kubernetes.docker_id" => "%{[container][id]}" }
        add_field => { "kubernetes.namespace_name" => "%{[kubernetes][namespace]}"}
        add_field => { "kubernetes.container_image" => "%{[container][image][name]}"}
        add_field => { "kubernetes.host" => "%{[kubernetes][node][name]}"}
        }
      mutate {
        remove_field => ["[kubernetes][node][labels]", "[kubernetes][pod][uid]","[kubernetes][pod][name]","[agent]","[kubernetes][namespace_uid]",
        "[container][id]", "[kubernetes][replicaset]","[container][image][name]",
        "[kubernetes][namespace]" , "[kubernetes][namespace_labels]", "[kubernetes][container][name]",
        "[kubernetes][node]"]
      }
    }

    output {
      if "_jsonparsefailure" not in [tags] {
            opensearch {
                hosts => ["https://admin:admin@opensearch-cluster-master.logging.svc.cluster.local:9200"]
                index => "%{index_label}-new-%{+YYYY.MM.dd}"
                user => "admin"
                password => "admin"
                ssl => true
                ssl_certificate_verification => false
          }
      }  
    }
  logstash.yml: |
    http.host: 0.0.0.0
    pipeline.ecs_compatibility: disabled
    log.level: debug

Expected behavior
Push logs successfully to Opensearch with memory cleanup.

Screenshots
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Host/Environment (please complete the following information):

• Running on Kubernetes
• Version 1.30

Additional context
Add any other context about the problem here.

[dblock]

May not be actually a leak, these processes may try to use all the memory they have. Does it eventually run out of memory in your case?