Search result unreliable version 8.1.1

[citybillykid]

When searching in "Notes", search result is unreliable. By using same search criteria, sometimes search result is correct, sometimes "No items to show".

Environment: Ubuntu 18.04.1 LTS 64bit Java 1.8.0_201 MySQL 5.7.25 Logicaldoc-CE 8.1.1

How to reproduce:

1. Add documents and check "Immediate indexing"
2. Add new Notes "keyword" for the documents
3. In Full-text Search, run search with criteria below Expression: keyword Search in: Notes
4. Run search by clicking the magifying glass after "Expression" .

Result: Sometimes return 1 result (as expectation) Sometimes return 0 result.