Search doesn't apply term presence

**Operating System**: Windows

**DocFX Version Used**: 2.57.2

**Template used**: default

**Steps to Reproduce**:

1. Replace the old version of lunr.js by the latest lunr.js version (2.3.9)
2. Search +word1 +word2 (**term presence** mechanism https://lunrjs.com/guides/searching.html)

**Expected Behavior**: All search result entries contain at least those two words

**Actual Behavior**: Is applying the default search (**or**) i.e. search entries with one of those two words.