increase log level from info to warn for "emptied out" search index u…

…pdate

Signed-off-by: Thomas Jäckle <thomas.jaeckle@beyonnex.io>

thingsearch/service/src/main/java/org/eclipse/ditto/thingsearch/service/persistence/write/streaming/EnforcementFlow.java

@@ -275,7 +275,7 @@ private Source<AbstractWriteModel, NotUsed> computeWriteModel(final Metadata met
                             }
                         } else {
                             // no enforcer; "empty out" thing in search index
-                            log.info(
+                            log.warn(
                                     "Computed - due to missing enforcer - 'emptied out' ThingWriteModel for metadata <{}> " +
                                             "and thing <{}>", metadata, thing);
                             return ThingWriteModel.ofEmptiedOut(metadata);