remove obsolete classes and methods

data-store/src/main/java/org/lucares/pdb/datastore/internal/CreateNewKey.java

@@ -1,20 +0,0 @@
-package org.lucares.pdb.datastore.internal;
-
-import java.util.function.Function;
-
-public class CreateNewKey implements Function<String, String> {
-
-	private final int index;
-
-	public CreateNewKey(final int index) {
-		this.index = index;
-	}
-
-	@Override
-	public String apply(final String key) {
-
-		final String result = String.valueOf(index);
-
-		return result;
-	}
-}