HSEARCH-1471 Removing zanata plugin and making sure image resources for docbook gets copied to right location
HSEARCH-1455 Cleaning up message logger interface. Removing unused methods and added @SuppressWarnings for deprecations
HSEARCH-1455 Updating docs

- Removing mention of @Similarity
- Removing mention of compound index option
- Fixing broken table formatting
HSEARCH-1455 Removing deprecation on ContextHelper, since this class is not replaceable for now
HSEARCH-1455 Adding @Deprecation annotation