the real cluster watermarks are the following:
  "cluster.routing.allocation.disk.watermark.high": "90%"
  "cluster.routing.allocation.disk.watermark.low": "85%"
set the alerts' thresholds to 85% and 80% (5% behind the real watermark)
Related-PROD: PROD-33841
Change-Id: I95ab8752fd60f8d698ee04386e296d42892b376f
     'default': {
         'service_failed_warning_threshold_percent': 0.3,
         'service_failed_critical_threshold_percent': 0.6,
-        'service_disk_space_watermark_minor_threshold_percent': 0.6,
-        'service_disk_space_watermark_major_threshold_percent': 0.75,
+        'service_disk_space_watermark_minor_threshold_percent': 0.8,
+        'service_disk_space_watermark_major_threshold_percent': 0.85,
     },
 }, grain='os_family', merge=salt['pillar.get']('elasticsearch:monitoring')) %}
 
     log_info "Setting up Python virtualenv"
     virtualenv $VENV_DIR
     source ${VENV_DIR}/bin/activate
-    python -m pip install salt${PIP_SALT_VERSION}
+    python -m pip install salt${PIP_SALT_VERSION} 'msgpack<1'
 }
 
 setup_mock_bin() {