After Update to Kopano 8.7.1: search - ERROR - could not process change for...

[ekpack]

WebApp: 3.5.6.2298+94.1
Kopano Core: 8.7.1
Z-Push: 2.5.0+0-0
Ubuntu 16.04.6 LTS

Hello together,

today I did the update from Kopano 8.7.0 to 8.7.1.
All went well.
But now I found the log entry

Sat Jun  1 08:58:28 2019: [warning] K-1540: Unable to get server list: Distributed not enabled

in the kopano.log (after the update (about two hours ago) and in the search,log the entry

2019-06-01 09:11:41,066 - query - INFO - Command: PROPS
2019-06-01 09:11:41,067 - query - INFO - Response: OK:125 100 3102 117 26510 26511 26
2019-06-01 09:11:42,081 - search - ERROR - Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/kopano/log.py", line 103, in log_exc
    try: yield
  File "/usr/lib/python3/dist-packages/kopano_search/__init__.py", line 393, in incremental_sync
    new_state = self.server.sync(importer, self.state, log=self.log)
  File "/usr/lib/python3/dist-packages/kopano/server.py", line 853, in sync
    return _ics.sync(self, self.mapistore, importer, state, max_changes, window=window, begin=begin, end=end, stats=stats)
  File "/usr/lib/python3/dist-packages/kopano/ics.py", line 253, in sync
    exporter.Config(stream, flags, importer, restriction, None, None, 0)
  File "/usr/lib/python3/dist-packages/MAPICore.py", line 2906, in Config
    return _MAPICore.IExchangeExportChanges_Config(self, lpStream, ulFlags, lpUnk, lpRestriction, lpIncludeProps, lpExcludeProps, ulBufferSize)
MAPI.Struct.MAPIErrorNetworkError: MAPI error 80040115 (MAPI_E_NETWORK_ERROR)

2019-06-01 09:12:07,134 - search - ERROR - could not process change for entryid 0000000022E2A8F9096E4D10A966E15231A3FCD90100000005000000DD6EABE3F76042679747B76CE4D17FFD00000000 ([SPropValue(0x65E00102, b'\x9a\n \x0e\xee\x1eO\xd0\x83I*\x85_\x12\xcd\x9e4\x1cW\x00\x00\x00'), SPropValue(0x65E10102, b'\x9a\n \x0e\xee\x1eO\xd0\x83I*\x85_\x12\xcd\x9e\xc1\x04S\x00\x00\x00'), SPropValue(0x0FFA0102, b'"\xe2\xa8\xf9\tnM\x10\xa9f\xe1R1\xa3\xfc\xd9'), SPropValue(0x0FFB0102, b'\x00\x00\x00\x00"\xe2\xa8\xf9\tnM\x10\xa9f\xe1R1\xa3\xfc\xd9\x01\x00\x00\x00\x01\x00\x00\x00\x15\xac\x08\xd4\x95\xd0CQ\xa9\xaf\x10\xb7\xfe\x9e\xb1\x17\x00\x00\x00\x00'), SPropValue(0x67110003, 9588742), SPropValue(0x67150003, 9098422), SPropValue(0x0FFF0102, b'\x00\x00\x00\x00"\xe2\xa8\xf9\tnM\x10\xa9f\xe1R1\xa3\xfc\xd9\x01\x00\x00\x00\x05\x00\x00\x00\xddn\xab\xe3\xf7`Bg\x97G\xb7l\xe4\xd1\x7f\xfd\x00\x00\x00\x00')]):
2019-06-01 09:12:07,135 - search - ERROR - Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/kopano/ics.py", line 125, in ImportMessageChange
    item.mapiobj = _utils.openentry_raw(mapistore, entryid.Value, 0)
  File "/usr/lib/python3/dist-packages/kopano/utils.py", line 86, in openentry_raw
    return _openentry_helper(mapistore, entryid, flags | MAPI_MODIFY)
  File "/usr/lib/python3/dist-packages/kopano/utils.py", line 80, in _openentry_helper
    return mapistore.OpenEntry(entryid, IID_IECMessageRaw, flags)
  File "/usr/lib/python3/dist-packages/MAPICore.py", line 965, in OpenEntry
    return _MAPICore.IMsgStore_OpenEntry(self, cbEntryID, lpInterface, ulFlags)
MAPI.Struct.MAPIErrorNetworkError: MAPI error 80040115 (MAPI_E_NETWORK_ERROR)

2019-06-01 09:12:07,140 - search - INFO - queue processed in 0.02 seconds (0 changes, ~0.00/sec)
2019-06-01 09:12:07,141 - search - INFO - saved server sync state = C3C40000AF322201
2019-06-01 09:15:32,538 - index0 - ERROR - Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/kopano/log.py", line 103, in log_exc
    try: yield
  File "/usr/lib/python3/dist-packages/kopano_search/__init__.py", line 213, in main
    store = server.store(storeguid)
  File "/usr/lib/python3/dist-packages/kopano/server.py", line 761, in store
    return _store.Store(guid=guid, entryid=entryid, server=self)
  File "/usr/lib/python3/dist-packages/kopano/store.py", line 99, in __init__
    mapiobj = self.server._store(guid)
  File "/usr/lib/python3/dist-packages/kopano/server.py", line 663, in _store
    table = self.ems.GetMailboxTable(None, 0) # XXX merge with Store.__init__
  File "/usr/lib/python3/dist-packages/MAPICore.py", line 2969, in GetMailboxTable
    return _MAPICore.IExchangeManageStore_GetMailboxTable(self, lpszServerName, ulFlags)
MAPI.Struct.MAPIErrorNetworkError: MAPI error 80040115 (MAPI_E_NETWORK_ERROR)

2019-06-01 09:15:32,546 - search - INFO - queue processed in 0.03 seconds (0 changes, ~0.00/sec)
2019-06-01 09:15:32,546 - index0 - ERROR - Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/kopano/log.py", line 103, in log_exc
    try: yield
  File "/usr/lib/python3/dist-packages/kopano_search/__init__.py", line 215, in main
    path = folder.path
  File "/usr/lib/python3/dist-packages/kopano/folder.py", line 236, in path
    root_entryid = self.store.root.entryid
  File "/usr/lib/python3/dist-packages/kopano/store.py", line 161, in root
    return _folder.Folder(self, _benc(HrGetOneProp(self._root, PR_ENTRYID).Value))
  File "/usr/lib/python3/dist-packages/kopano/store.py", line 115, in _root
    self.__root = self.mapiobj.OpenEntry(None, None, 0)
  File "/usr/lib/python3/dist-packages/MAPICore.py", line 965, in OpenEntry
    return _MAPICore.IMsgStore_OpenEntry(self, cbEntryID, lpInterface, ulFlags)
MAPI.Struct.MAPIErrorNetworkError: MAPI error 80040115 (MAPI_E_NETWORK_ERROR)

2019-06-01 09:15:32,548 - search - INFO - saved server sync state = C3C40000B0322201
2019-06-01 09:17:52,799 - search - ERROR - could not process change for entryid 000000001DAE5E94AD8049F5B062A874D8DFAD080100000005000000C860F4576AE948D8B7E1DD2ABF9DD02D00000000 ([SPropValue(0x65E00102, b'\x9a\n \x0e\xee\x1eO\xd0\x83I*\x85_\x12\xcd\x9e6\x1cW\x00\x00\x00'), SPropValue(0x65E10102, b'\x9a\n \x0e\xee\x1eO\xd0\x83I*\x85_\x12\xcd\x9e\xbd\x07\x00\x00\x00\x00\x00\x00'), SPropValue(0x0FFA0102, b'\x1d\xae^\x94\xad\x80I\xf5\xb0b\xa8t\xd8\xdf\xad\x08'), SPropValue(0x0FFB0102, b'\x00\x00\x00\x00\x1d\xae^\x94\xad\x80I\xf5\xb0b\xa8t\xd8\xdf\xad\x08\x01\x00\x00\x00\x01\x00\x00\x00z\xd4\xe8H\x90VJU\x86>\xaf0\xf4\x0e\xa0\x9f\x00\x00\x00\x00'), SPropValue(0x67110003, 9588746), SPropValue(0x67150003, 3871), SPropValue(0x0FFF0102, b'\x00\x00\x00\x00\x1d\xae^\x94\xad\x80I\xf5\xb0b\xa8t\xd8\xdf\xad\x08\x01\x00\x00\x00\x05\x00\x00\x00\xc8`\xf4Wj\xe9H\xd8\xb7\xe1\xdd*\xbf\x9d\xd0-\x00\x00\x00\x00')]):
2019-06-01 09:17:52,800 - search - ERROR - Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/kopano/ics.py", line 125, in ImportMessageChange
    item.mapiobj = _utils.openentry_raw(mapistore, entryid.Value, 0)
  File "/usr/lib/python3/dist-packages/kopano/utils.py", line 86, in openentry_raw
    return _openentry_helper(mapistore, entryid, flags | MAPI_MODIFY)
  File "/usr/lib/python3/dist-packages/kopano/utils.py", line 80, in _openentry_helper
    return mapistore.OpenEntry(entryid, IID_IECMessageRaw, flags)
  File "/usr/lib/python3/dist-packages/MAPICore.py", line 965, in OpenEntry
    return _MAPICore.IMsgStore_OpenEntry(self, cbEntryID, lpInterface, ulFlags)
MAPI.Struct.MAPIErrorNetworkError: MAPI error 80040115 (MAPI_E_NETWORK_ERROR)

2019-06-01 09:17:52,806 - search - INFO - queue processed in 0.02 seconds (0 changes, ~0.00/sec)
2019-06-01 09:17:52,807 - search - INFO - saved server sync state = C3C40000B1322201

Is this something I have to worry about?
DeskApp, Webapp and Z-Push seem to work normally.