Queries with NOT in between throw error

[laggingreflex]

const data = [
{ name: 'C-3PO'           , description: 'Protocol droid.'                , species: 'Droid' },
{ name: 'R2-D2'           , description: 'Astromech droid built on Naboo.', species: 'Droid' },
{ name: 'Anakin Skywalker', description: 'Fallen Jedi, the chosen one.'   , species: 'Human' },
{ name: 'Obi-Wan Kenobi'  , description: 'Jedi Master.'                   , species: 'Human' },
{ name: 'Moon Moon'       , description: 'Mentally challenged wolf.'      , species: 'Wolf'  },
];

console.log(data.filter(lucene('an NOT anakin')));

Expected: "Obi-Wan Kenobi"

Current result: Throws an error:

C:\…\lucene-filter\src\index.js:28
      return lucene.operators[query.operator](
                                             ^

TypeError: lucene.operators[query.operator] is not a function
    at compile (C:\…\lucene-filter\src\index.js:28:46)
    at Object.<anonymous> (C:\…\index.js:52:25)
    at Module._compile (internal/modules/cjs/loader.js:1185:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1205:10)
    at Module.load (internal/modules/cjs/loader.js:1034:32)
    at Function.Module._load (internal/modules/cjs/loader.js:923:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
    at internal/main/run_main_module.js:17:47

[finwo]

Looks like I've never created the NOT operator. I'll have to look into the lucene specification on what this will have to do.