How to set the type of fields using elasticsearch-hadoop cascading

Hi all:
I want to use ESTap to dump my hadoop data to es,but I came across a
problem,when I export data to a new index, I
set,so index can be created, and mapping type can
be created as well, but the type of fields always is string,I want to set
one field to long,how should I do?
below is method I haved tried but failed:
suppose the field name is count and both index and mapping type are uv,I
have following setting.
props.setProperty("", "long");

Anyone knows?

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