Excluding attributes from indexing

Steps

Use dsconfig to set attribute indexing on all user attributes in the changelog backend.

Example:

The following command includes all user attributes except the description and location attributes.
```
$ bin/dsconfig set-backend-prop --backend-name changelog \
  --set "index-include-attribute:*" \
  --set "index-exclude-attribute:description \
  --set "index-exclude-attribute:location
```