db.coll.insert({_id: 1, point: [0, 0], indexed: 1, unindexed: 1});
assert.commandWorked(db.coll.ensureIndex({point: 'geoHaystack', indexed: 1}, { bucketSize:1}));
function geoSearch(search) {
    return assert.commandWorked(
        db.coll.runCommand('geoSearch', {near: [0, 0], maxDistance: 1, search: search}));
}

// Try with search on indexed field. (works)
assert.eq(geoSearch({indexed: 1}).results.length, 1, "indexed");

// Try with search on unindexed field. (fails)
assert.eq(geoSearch({unindexed: 1}).results.length, 1, "unindexed");

// Try with empty search. (fails)
assert.eq(geoSearch({}).results.length, 1, "empty");