[LMS-504] fix: - ETL server Unit tests.

minor: - Improve javadoc and put final keyword when possible.

SVN: 7554

integration-tests/templates/etlserver-all/etc/service.properties

@@ -59,6 +59,8 @@ inputs=raw-data,image-analysis
 # ---------------------------------------------------------------------------
 # The directory to watch for incoming data.
 raw-data.incoming-dir = ../data/out-raw
+# The group the samples extracted by this thread belong to. If commented out or empty, then samples
+# are considered global (not group private). 
 raw-data.group-code = CISD
 
 # The extractor plugin class to use for data set information extraction
@@ -95,6 +97,8 @@ raw-data.storage-processor.file-extractor = ch.systemsx.cisd.etlserver.imsb.HCSI
 # image-analysis thread
 # ---------------------------------------------------------------------------
 image-analysis.incoming-dir = ../data/out-analysis
+# The group the samples extracted by this thread belong to. If commented out or empty, then samples
+# are considered global (not group private). 
 image-analysis.group-code = CISD
 
 image-analysis.data-set-info-extractor = ch.systemsx.cisd.etlserver.threev.DataSetInfoExtractorForImageAnalysis