Use consistent phrasing in log messages and exceptions

Description

In particular, we should pick a tense (past or present) and stick to it.

See https://github.com/hibernate/hibernate-search-6-poc/pull/68#discussion_r194422418

Environment

None
Fixed

Assignee

Yoann Rodière

Reporter

Yoann Rodière

Labels

None

Suitable for new contributors

None

Feedback Requested

None

Fix versions

Priority

Major
Configure