reintegrated branch solr75 -r53828:HEAD
using apache commons lang3
map solr data types directly from the MDFormat profile
does not delete the root path on zookeeper when it does not exist
store the __result field as bare string, disabling docValues
force solr configuration files upon collection creation
upgraded solr version to 6.6.0
added changelog entry, the field name is string_ci, forget the previous commit message
cleanup, introduced text_ci to index untokenized field values and allow case insensitive querying
removed s* numeric field types, they are deprecated in most recent versions
indentation
integrated changes from dnet40: added support for create multiple shards for the same collection on the same solr server
commented out suggester component causing slow startup
codebase used to migrate to java8 the production system