Pages with underscores in their titles do not appear in the Quick/Advanced Search results.

Issue Summary

Pages with underscores (_) in their titles do not appear in either Quick or Advanced search when the word after the underscore is used as a search term.

Utilizing Confluence search syntax does not seem to resolve this issue.

Steps to Reproduce

1. Create a page and include an underscore (_) in its title.
   • For example: Hello_Test
2. Perform a search using either the Quick or Advanced search with the term Test.
3. Perform a search using either the Quick or Advanced search with the term "*_Test" or  "*Test"  (Confluence search syntax).

Expected Results

The page created in the first step should appear in the search results.

Actual Results

Even after reindexing Confluence, the page is still not returned in the search results.

However, if we visit the page directly either using its link or page tree from the left sidebar menu, if we perform the search again the page appears in the search results 

Workaround

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