opencga_574_add_studies_field_to_stage.js

// Use migration script https://gist.github.com/j-coll/c2b81a7ff8392ec6b5208b5a8bf0d3d3
var otherKeys = {
    _id : "",
    end : "",
    ref : "",
    alt : ""
};
migrateCollection("stage", {"_i" : {"$exists" : false} }, {}, function(bulk, doc) {
    var _i = [];

    for (var i in doc) {
        if (!otherKeys.hasOwnProperty(i)) {
            _i.push(i);
        }
    }

    bulk.find({ "_id" : doc._id}).updateOne({ "$set" : {"_i" : _i} });
});

db.stage.ensureIndex( {"_i" : 1}, {"background" : true})