Issue Summary

com.atlassian.confluence.search.v2.SearchManager#search(com.atlassian.confluence.search.v2.ISearch) does not return results when the search query contains additional words that do not exist in page title/content

This is reproducible on Data Center: yes

Steps to Reproduce

1. Create a page with the title "How to approve" and the content "approval process"
2. Run a search using com.atlassian.confluence.search.v2.SearchManager#search(com.atlassian.confluence.search.v2.ISearch) with highlights enabled for the text "How to approve travel"
   • In 8.5.0+ versions this can be tested by using the knowledge-base plugin. You can POST to: <base-url>/rest/knowledge-base/1.0/searchV2 with a payload like 

     {"query":"How to approve travel", "startIndex":0, "pageSize":10, "type":"page", "includeArchivedSpaces":false, "highlight":true }

Expected Results

{
  "results": [
    {
      "id": 393236,
      "title": "@@@hl@@@How@@@endhl@@@ to @@@hl@@@approve@@@endhl@@@",
      "bodyTextHighlights": "",
      "url": "/display/TEST/How+to+approve",
      "contentType": "page",
      "metadata": {
        "content-version": "1",
        "userCanView": "true",
        "latest-version-id": "393236"
      },
      "spaceKey": "TEST",
      "spaceName": "TEST"
    }
  ],
  "total": 1
} 

Actual Results

{
  "results": [],
  "total": 0
} 

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available