Empty date is not getting detected!

[adarshzphin]

I have below dynamic mapping for index "my_index"
PUT my_index
{
"mappings": {
"dynamic_templates": [
{
"objects": {
"match_mapping_type": "object",
"mapping": {
"type": "nested"
}
}
}
],
"dynamic_date_formats": "yyyy-MM-dd||yyyy-MM-dd HH:mm:ss"
}
}

Now, when I am inserting data into es. It is giving me below error like:
org.elasticsearch.hadoop.rest.EsHadoopRemoteException: mapper_parsing_exception: failed to parse field [raw_derived.applications.accounts.dateclosed] of type [date] in document with id '02cf10ae-93c4-45a3-99bb-a0d01f24fa86'. Preview of field's value: '';org.elasticsearch.hadoop.rest.EsHadoopRemoteException: illegal_argument_exception: cannot parse empty date

there is field called "dateclosed". It is having value or sometimes empty values.
How can I set dynamically in the mapping to ignore empty value from date fields?

Any suggestion would be helpful.