restoring indexes for collection mydb.menudatas from metadata

[baka207]

Failed: mydb.menudatas: error creating indexes for mydb.menudatas: createIndex error: The field 'safe' is not valid for an index specification. Specification: { name: "category_1", ns: "mydb.menudatas", background: true, safe: null, key: { category: 1 } }

[nicats]

if you write the problem in stackoverflow you can find answer:
https://stackoverflow.com/a/41036997/3729763