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31 | # File 'lib/logstash/outputs/elasticsearch/ilm.rb', line 13
def ilm_in_use?
  return @ilm_actually_enabled if defined?(@ilm_actually_enabled)
  @ilm_actually_enabled =
    begin
      if serverless?
        raise LogStash::ConfigurationError, "Invalid ILM configuration `ilm_enabled => true`. " +
          "Serverless Elasticsearch cluster does not support Index Lifecycle Management." if @ilm_enabled.to_s == 'true'
        @logger.info("ILM auto configuration (`ilm_enabled => auto` or unset) resolved to `false`. "\
          "Serverless Elasticsearch cluster does not support Index Lifecycle Management.") if @ilm_enabled == 'auto'
        false
      elsif @ilm_enabled == 'auto'
        ilm_alias_set?
      elsif @ilm_enabled.to_s == 'true'
        ilm_alias_set?
      else
        false
      end
    end
end |