remove OpenBitSet from documentation

Description

OpenBitSet was removed from Lucene 5.0 as noted in LUCENE-6010, but the class is still used in the documentation:

Example 5.21. Defining and implementing a Filter

Please migrate the example in the documentation to the current Lucene API.

Environment

None

Status

Assignee

Sanne Grinovero

Reporter

b

Labels

None

Suitable for new contributors

None

Feedback Requested

None

Components

Fix versions

Affects versions

Priority

Major
Configure