Ctrl A separated csv file elasticsearch not indexing using logstash

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I am using the config:

input {
file {
path => "/tmp/test12.csv"
type => "Sample"
start_position => "beginning"
}
}

filter {
csv {
columns => ["col1","col2,"col3","col4"]
separator => '\u0001'
}
}

output {
elasticsearch {
action => "index"
host => "localhost"
index => "t2"
document_id => "%{col1}"
}
}

For separator using '\u0001' but its not working

I don't think such escape sequences are supported. Have you tried inserting a literal \u0001 byte in the file instead?

its not working

@magnusbaeck any solution for this?

No, I don't have a solution.