OZG-2542 ElasticSearchEventListener implementiert

pluto-server/pom.xml

.../main/java/de/itvsh/ozg/pluto/PlutoServerApplication.java

...g/pluto/common/elastic/ElasticsearchIndexInitializer.java

...vsh/ozg/pluto/common/elastic/ElasticsearchProperties.java

...e/itvsh/ozg/pluto/common/elastic/ElasticsearchITCase.java

...o/common/elastic/ElasticsearchIndexInitializerITCase.java

...ommon/elastic/ElasticsearchIndexerEnabledInitializer.java

...sh/ozg/pluto/common/elastic/ElasticsearchInitializer.java

.../ozg/pluto/common/elastic/ElasticsearchServiceITCase.java