fix(ElasticsearchService): log bad request error details

solidify-index/src/main/java/ch/unige/solidify/index/indexing/elasticsearch/ElasticsearchService.java

@@ -548,6 +548,7 @@ public abstract class ElasticsearchService<T extends IndexMetadata> extends Inde
       throw new SolidifyRuntimeException("Error when searching index " + indexName + " with request " + q, e);
     } catch (ElasticsearchStatusException e) {
       if (RestStatus.BAD_REQUEST.equals(e.status())) {
+        log.error("Bad search request", e);
         throw new SolidifyValidationException(new ValidationError(IndexConstants.BAD_SEARCH_REQUEST));
       } else {
         throw e;