Merge pull request #47823 from cms-AlCaDB/alca-fix_PoolDBESSource_params_15_0_X

[15_0_X] Add transactionId as optional parameter of CondDBESSource

Author: cmsbuild

Diff for: CondCore/ESSources/plugins/CondDBESSource.cc

@@ -759,6 +759,7 @@ void CondDBESSource::fillDescriptions(edm::ConfigurationDescriptions& descriptio
   dbParams.addUntracked<std::string>("security", "");
   dbParams.addUntracked<int>("messageLevel", 0);
   dbParams.addUntracked<int>("connectionTimeout", 0);
+  dbParams.addOptionalUntracked<std::string>("transactionId", "")->setComment("This parameter is not strictly needed by PoolDBESSource, but the WMCore infrastructure requires it.");
   desc.add("DBParameters", dbParams);
 
   desc.add<std::string>("connect", std::string("frontier://FrontierProd/CMS_CONDITIONS"));