How to get total term frequency within a document

Elastic Stack Elasticsearch
1

i am writing java code for getting total term frequency(number of times a
term occured within a document).
please help me to write this.

here is the document that i inserted into elastic search index.
"resp_aaa_error":[
{"edi_location":"Payer","error_code":"45","followup_action_code":"R"},
{"edi_location":"Payer
ID","error_code":"45","followup_action_code":"R"},
{"edi_location":"Dependent
ID","error_code":"45","followup_action_code":"R"},
{"edi_location":"Subscriber
ID","error_code":"45","followup_action_code":"R"}
]
but when i count how many no of times error_code is equal to 45, it
returns 1.
but i want it to return 4 as it is 4 times in my document.

please help me. it's kind of urgent.

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