Search a keyword in a field value string

I need to check whether the given filed value string contain word call 'select'

Ex : field request return following result

So I need the correct elasticsearch syntax to track result which are having word called 'select' in request field in the elasticsearch indexes.

I have tried following syntax, but it return an error

"filtered": {
"query": {
"query_string": {
"default_field": "request",
"query": "select OR SELECT"


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