[maven-release-plugin] prepare for next development iteration
[maven-release-plugin] prepare release dnet-index-client-2.3.4
using solr 7.5.0 compatible version of dnet-index-solr-common
reintegrated solr75 branch (-r53777:HEAD)
[maven-release-plugin] prepare release dnet-index-client-2.3.3
[maven-release-plugin] prepare release dnet-index-client-2.3.2
[maven-release-plugin] prepare release dnet-index-client-2.3.1
depending on released parent
migrated to dnet45
codebase used to migrate to java8 the production system