localDb> db.help.createIndex({fielda:“text”})
TypeError: db.help.createIndex is not a function
Getting this error in Mongosh
In the shell (and this is true both for the legacy mongo as well as for mongosh) the help property of most objects is special as it is used for the integrated contextual help. If in mongosh you do db.help or db.help() the shell prints out the help content for the database class.
To get around that, you can do:
db.getCollection('help').createIndex({fielda:"text"})
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Thank you so much for the root cause …it was confusing when the command did not work , 
your solution worked …we have just started on Mongodb, will probably change the collection name.
Thanks again
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