Merge branch 'develop' of https://github.com/Deutsche-Digitale-Bibliothek/ddb-next into develop
Merge branch 'develop' of https://github.com/Deutsche-Digitale-Bibliothek/ddb-next into develop
Merge branch 'develop' of https://github.com/Deutsche-Digitale-Bibliothek/ddb-next into develop
bugfix/DDBNEXT-583: convert each item ID to lower case.

 ElasticSearch by default enables [the standard
 analyser](http://www.elasticsearch.org/guide/reference/index-modules/analysis/standard-analyzer/)
 and therefore use [Lowercase Token
 Filter](http://www.elasticsearch.org/guide/reference/index-modules/analysis/lowercase-tokenfilter/)

 If we store a string FOOBAR, I assume it store the string as foobar and
 therefore if we try to find FOOBAR it return nothing.

 This workaround convert the search string to foobar, before we send the query
 to Elastic Search.

 The next obvious step will be to disable Lower Case Token Filter.
Merge branch 'bugfix/DDBNEXT-583' into develop