Deleted documents still appear in searches - (through substrings)

[thomscoder]

Describe the bug
Most likely related to #39 ( @lucaong ). On Lyra 0.0.1-beta-14...

To Reproduce

import { Lyra } from '@nearform/lyra';

const lyra = new Lyra({
  schema: {
    word: "string",
  }
});

const { id: halo } = await lyra.insert({ word: 'Halo' });
const { id: halloween } = await lyra.insert({ word: 'Halloween' });
const { id: greenLantern } = await lyra.insert({ word: 'Hal' });

await lyra.delete(halo);

const search = await lyra.search({
  term: 'Hal',
});

console.log(search);

The results returns an id but no match

{
  elapsed: '164μs',
  hits: [
    { id: 'FUKQeo1l-rnOwzQyHLSlf', word: 'Hal' },
    { id: 'oMk8_x6NpV6siIn6SysEE' },
    { id: '3uv5A8-OCVIxfbwcWzxK7', word: 'Halloween' }
  ],
  count: 3
}

Expected behavior

{
  elapsed: '164μs',
  hits: [
    { id: 'FUKQeo1l-rnOwzQyHLSlf', word: 'Hal' },
    { id: '3uv5A8-OCVIxfbwcWzxK7', word: 'Halloween' }
  ],
  count: 2
}

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Screenshot