Even if the rendered document looks fine, ligatures can still exist in the extracted text. In the preceding example, a text extractor incorrectly joined `fi`, `fl` and others together so they appear as `\u0000` in the raw text. You see `\u0000re` instead of `fire` and `over\u0000ow` instead of `overflow`.
To find out if ligatures exist in the extracted text for your document, extract all the lines in the document and search for Unicode characters. To extract all lines into one key-value pair, use a config like:
```json
{
"fields": [
{
"id": "all_lines_in_doc",
"method": {
"id": "documentRange",
"includeAnchor": true
},
"anchor": {
"match": {
"type":"first"
}
}
}
],
}