Migrate solr config files to solr4, add standalone log4j configuration (use log4j daily appender logger) for solr and reference it in web.xml, merge web.xml custom dspace with web.xml solr4 default
Add standalone lucene-queryparser (before went with core), added specific solr.version property, update elasticsearch to avoid references to lib <lucene4
From version 4.3.0 aims for complete logging flexibility, it don't include logging jars in the .war file, so we provide them with the inclusion of commons-logging
Migrate discovery to solr4
Migrate search to lucene 4
Migrate statistics to solr4
Exception surrounded modified in solr4
Update to new solr server object
Update modules to solr4
Update elasticsearch references to new version
Fixing usage statistics logging by adding update chain for uid
Merge pull request #1 from KevinVdV/DS-1623

Fixing usage statistics logging by adding update chain for uid
Logging mechanism fix
Updated solrj version by get it from solr.version property
Merge pull request #2 from KevinVdV/DS-1623

Logging mechanism fix
Fix context parameter log4j.configuration in solr web.xml
Fix npe on requiresIndexing
Merge pull request #289 from lap82/DS-1623

[DS-1623] Upgrade DSpace-SOLR to SOLR 4