Unable to run select query via PrestoDB on mongodb

Getting below error while executing Select query from Presto on mongoDB.

com.mongodb.MongoCommandException: Command failed with error 13: ‘not authorized on collection to execute command { createIndexes: “_schema”, indexes: [ { key: { table: 1 }, name: “table_1”, ns: “collection._schema”, unique: true } ] }’

We have created readonly MongoDB user for Presto.

Why are we getting createIndex error for select query? How to fix this issue. Please suggest.