For some reason I have 2.6 table where there is some recoverable error in geo index.
Now, trying to upgrade to 3.0 / wireTiger, when importing, I get error:

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2015-05-28T22:59:24.045+0300 Failed: restore error: mydb.lanecollections: error creating indexes for mydb.lanecollections: createIndex error: exception: Can't extract geo keys: { _id: ObjectId('5417eaf5f5a2cc5e6080a43c'), line:

{ type: "LineString", coordinates: [ [ 24.6920309, 59.4035288 ], [ 24.6920309, 59.4035288 ] ] }

, start_location: [ 539308.20195574, 6585269.98355083 ], end_location: [ 539308.20195574, 6585269.98355083 ], width: 0.5, preferred_percentile: 0.5, neighbours: [] } GeoJSON LineString must have at least 2 vertices: [ [ 24.6920309, 59.4035288 ], [ 24.6920309, 59.4035288 ] ]
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It would not be of a great problem otherwise, since the collection is not used any more. But since it breaks the restore process, no matter the parameters I use.

Since there already is an option to continue on errors, this situation should obey the option and continue without creating the index.