Support $search

[ekryski]

This is a proposed special attribute that allows you to fuzzy match a property. Possibly even multiple properties and/or nested documents.

Suggested syntax:

name: {
  $search: ['alice', 'Alice', 'bo', /$bob/i]
}

Following similar syntax to our other special query filters, this would allow you to filter by a singular value, multiple values (treated like an or) and/or regular expressions directly.

Internally mongodb requires a $regex query but we can fairly easily build a singular regex from this array. Another internal construct that mongodb provides is $text so we might be able to use that for full text search.

[daffl]

See feathersjs/feathers#334