Logstash date parsing error ( date field doesn't have any time)

Question

My data has date in the format yyyy-MM-dd ex : "2015-10-12"

My logstash date filter is as below

    input {
            file {
                    path => "/etc/logstash/immport.csv"

                    codec => multiline {
                    pattern => "^S*"
                    negate => true
                    what => "previous"

            }
                    start_position => "beginning"
            }

    }
    filter {
            csv {

                    separator => ","
                    autodetect_column_names => true
                    skip_empty_columns => true
            }

            date {
            match => ["start_date", "yyyy-MM-dd"]
                    target => "start_date"
            }
            mutate {
                 rename => {"start_date" => "[study][startDate]"}
            }

    }
    output {
        elasticsearch {
                action => "index"
                hosts => ["elasticsearch-5-6:9200"]
                index => "immport12"
                document_type => "dataset"
                template => "/etc/logstash/immport-mapping.json"
        template_name => "mapping_template"
        template_overwrite => true
        }

        stdout { codec => rubydebug }
}

However, my es instance is not able to parse it and I'm getting following error

"error"=>{"type"=>"mapper_parsing_exception", "reason"=>"failed to parse [study.startDate]", "caused_by"=>{"type"=>"illegal_argument_exception", "reason"=>"Invalid format: \"2012-04-17T00:00:00.000Z\" is malformed at \"T00:00:00.000Z\""}}}}}

Sample Data Row ][logstash.outputs.elasticsearch] Could not index event to Elasticsearch. {:status=>400, :action=>["index", {:_id=>nil, :_index=>"immport_2017_12_02", :_type=>"dataset", :_routing=>nil}, 2017-12-20T08:55:45.367Z 878192e51991 SDY816,HEPSV_COHORT: Participants that received Heplisav,,,2012-04-17,,10.0,Systems Biology Analysis of the response to Licensed Hepatitis B Vaccine (HEPLISAV) in specific cell subsets (see companion studies SDY299 and SDY690),Interventional,http://www.immport.org/immport-open/public/study/study/displayStudyDetail/SDY816,,Interventional,Vaccine Response,Homo sapiens,Cell,DNA microarray], :response=>{"index"=>{"_index"=>"immport_2017_12_02", "_type"=>"dataset", "_id"=>"AWBzIsBPov62ZQtaldxQ", "status"=>400, "error"=>{"type"=>"mapper_parsing_exception", "reason"=>"failed to parse [study.startDate]", "caused_by"=>{"type"=>"illegal_argument_exception", "reason"=>"Invalid format: \"2012-04-17T00:00:00.000Z\" is malformed at \"T00:00:00.000Z\""}}}}}

I want my logstash to output date in this format yyyy-MM-dd without timestamp Mapping template

"startDate": {
         "type": "date",
        "format": "yyyy-MM-dd"
 },

Answer 1

The issue was I changed the logstash mapping template name to new name, I didn't delete the old template file and hence the index was still pointing to old template file

once I deleted the old template file

curl -XDELETE 'http://localhost:9200/_templates/test_template' 

it worked, so whenever we are using new template it's required to delete old template and then process records