Could not index event to elasticsearch error

Elastic Stack Logstash
1

Hello guys, I am getting following error about my filter and I have no clue why it is happening. I have included details.

Filter

filter {
	if "cost_management" in [tags] {
		fingerprint {
			source => "message"
			target => "[@metadata][fingerprint]"
			method => "MURMUR3"
		}
		# Parsing of json events.
		json {
			source => "message"
			tag_on_failure => [ "_grok_error_log_nomatch" ]
		}
		# If line doesnt matched then drop that line.
		if "_grok_error_log_nomatch" in [tags] {
			drop { }
		}
		# Set timestamp as per input log events.
		date {
			# date format : 2019-12-23 23:28:42
			match => [ "timestamp", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm:ss ", " yyyy-MM-dd HH:mm:ss", "ISO8601" ]
			target => "@timestamp"
		}
		# Set index name as per given tags.
		mutate {
			add_field => [ "index_name", "cost_management" ]
		}
		mutate {
			convert => {
				"monthly_total_bill" => "float"
				"last_day_bill" => "float"
				"monthly_service_bill" => "float"
				"last_day_service_bill" => "float"
			}
		}
		# Remove unwanted tags from sorted logs.
		mutate {
			remove_tag => ["beats_input_codec_plain_applied", "beats_input_codec_plain_applied", "_grokparsefailure", "_geoip_lookup_failure", "multiline", "_jsonparsefailure"]
		}
	}
}

Error

[2021-03-16T18:34:12,627][ERROR][logstash.outputs.elasticsearch][main] Could not index event to Elasticsearch. {:status=>400, :action=>["index", {:_id=>"3618653390", :_index=>"cost_management,cost_management-2021.03.16", :routing=>nil, :_type=>"_doc"}, #<LogStash::Event:0xa8069bb>], :response=>{"index"=>{"_index"=>"cost_management,cost_management-2021.03.16", "_type"=>"_doc", "_id"=>"3618653390", "status"=>400, "error"=>{"type"=>"invalid_index_name_exception", "reason"=>"Invalid index name [cost_management,cost_management-2021.03.16], must not contain the following characters [ , \", *, \\, <, |, ,, >, /, ?]", "index_uuid"=>"_na_", "index"=>"cost_management,cost_management-2021.03.16"}}}}

My Output Filter

output {
	file {
		create_if_deleted => true
		path => "/var/log/logstash/logstash_log"
		codec => "rubydebug"
	}
	elasticsearch {
		hosts => ["localhost:9200"]
		user => "admin"
		password => "passwd"
		manage_template => false
		index => "%{[index_name]}-%{+YYYY.MM.dd}"
		document_id => "%{[@metadata][fingerprint]}"
		http_compression => true
	}
}

What I have understood is that because of my output filter, logstash is inserting two index names separated by comma and elasticsearch is rejecting the indexing request. But I am unable to debug it. But my final index name should be cost_management-2021.03.16 only.
Please help me out. Thank you.

2 
mutate { add_field => [ "index_name", "cost_management" ] }

"reason"=>"Invalid index name [cost_management,cost_management-2021.03.16], must not contain the following characters [ , \", *, \\, <, |, ,, >, /, ?]", "index_uuid"=>"_na_", "index"=>"cost_management,cost_management-2021.03.16"}}}}

If that mutate gets executed twice, then [index_name] will be an array, which the code will present as "cost_management,cost_management".

You could avoid this by using

mutate { replace => { "index_name" => "cost_management" } }

but you should really try to find why it is getting executed twice, since that may mean other things are being done twice. For example, if you point path.config at a directory then it will concatenate all the files in the directory into a single configuration. If the directory contains my.conf and my.conf.bak then the contents of both are part of the configuration.

3

My bad. My conf.d/ had same filter with different name. Removing that worked for me. Thank you very much.