[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 If applicable, add screenshots to help explain your problem.

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?