default Logstash index

[dirnikk]

Hi everyone,

Is there a way to edit the name of the default logstash index.
With the config I am able to create desired index called ltb-service and everything is fine.
But there is a default logstash index which also populates to the Opensearch cluster and I am not sure how to change the name of index.
I want to do that because if there are 2 EKS clusters sending logs they ingest on the same index.
Any Idea?
I have the following config file:

replicaCount: 2

serviceAccount:
  name: fluent-bit-o
  annotations:
    eks.amazonaws.com/role-arn: arn:aws:iam::1234567890:role/logging-fluent
resources:
    requests:
      cpu: 200m
      memory: 256Mi
    limits:
      cpu: 200m
      memory: 512Mi
luaScripts:
  utils.lua: |
      -- Function to add an index prefix field
      function add_index_prefix_field(tag, timestamp, record)
        -- Define a list of namespaces to include
        namespaces = {"ltb-service"}

        -- Set the default return code to 0 (no change)
        retcode = 0

        -- Set the prefix value
        prefix = 'eks'

        -- Get the namespace from the record's "kubernetes" field
        namespace = record['kubernetes']['namespace_name']

        -- Check if the namespace is in the list of namespaces to include
        for _, value in ipairs(namespaces) do
          if value == namespace then
            -- Create the index prefix using the prefix value and the namespace name
            index_prefix = prefix .. '_' .. namespace

            -- Add the index prefix field to the record
            record['index_prefix'] = index_prefix

            -- Set the return code to 2 (update record)
            retcode = 2

            -- Break out of the loop
            break
          end
        end

        -- Return the return code, timestamp, and modified record
        return retcode, timestamp, record
      end


config:
  inputs: |
    [INPUT]
        Name tail
        Path  /var/log/containers/*.log
        multiline.parser docker, cri
        Tag kube.*
        Mem_Buf_Limit 5MB
        Skip_Long_Lines On
  filters: |
    [FILTER]
        Name                kubernetes
        Match               *
        Kube_URL            https://kubernetes.default.svc:443
        Kube_CA_File        /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
        Kube_Token_File     /var/run/secrets/kubernetes.io/serviceaccount/token
        Kube_Tag_Prefix     kube.var.log.containers.
        Merge_Log           On
        Merge_Log_Key       log_processed
        K8S-Logging.Parser  On
        K8S-Logging.Exclude On
    [FILTER]
        Name      lua
        Match     *
        script    /fluent-bit/scripts/utils.lua
        call      add_index_prefix_field
  outputs: |
    [OUTPUT]
        Name            opensearch
        Match           *
        Host            opensearch-ingest.example.com
        Port            443
        TLS             On
        AWS_Auth        On
        Suppress_Type_Name On
        AWS_Region      us-east-1
        Logstash_Format On
        Logstash_Prefix_Key $index_prefix
        Buffer_Size     False
        Time_Key        @timestamp
        Trace_Error     On
        Replace_Dots    On
tolerations:
  - operator: Exists