BUGFIX: Use multi_match instead of query_string#311

gerhard-boden wants to merge 1 commit intoFlowpack:mainFlowpack/Flowpack.ElasticSearch.ContentRepositoryAdaptor:mainfrom

gerhard-boden:bugfix-use-multi-match-instead-of-query-stringgerhard-boden/Flowpack.ElasticSearch.ContentRepositoryAdaptor:bugfix-use-multi-match-instead-of-query-stringCopy head branch name to clipboard