Kibana Visualization-New field

hi all.
I have defined a new field by the grok filter and i see it in the Discovery section, but i don't see it in the field list for visualization by a linear chart and sum aggregation function. how can i resolved it?

You may need to go to Index Pattern management and refresh the index pattern relating to the field.

thanks. Your suggestion was made But it didn't using a scripted field (doc['num_extract'].value;) this problem solved.

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