DFSN service has started performing complete refresh of metadata for namespace Documents.

We are seeing the following alert - is this something to be concerned about?

Log Name:      Microsoft-Windows-DFSN-Server/Admin
Source:        Microsoft-Windows-DFSN-Server
Date:          04/07/2018 12:46:01
Event ID:      516
Task Category: None
Level:         Warning
Keywords:      Operational
User:          SYSTEM
Computer:      %computername%.domain.suffix
Description:
DFSN service has started performing complete refresh of metadata for namespace Documents. This task can take time if the namespace has large number of folders and may delay namespace administration operations.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-DFSN-Server" Guid="{B6C4E17A-2CAC-4273-A390-6F6B8C8C9F01}" />
    <EventID>516</EventID>
    <Version>0</Version>
    <Level>3</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x4000000000000010</Keywords>
    <TimeCreated SystemTime="2018-07-04T11:46:01.531663600Z" />
    <EventRecordID>145251</EventRecordID>
    <Correlation ActivityID="{4968B9B8-6CF0-0001-449A-22AEC402D401}" />
    <Execution ProcessID="1236" ThreadID="1408" />
    <Channel>Microsoft-Windows-DFSN-Server/Admin</Channel>
    <Computer>%computername%.domain.suffix</Computer>
    <Security UserID="S-1-5-18" />
  </System>
  <EventData>
    <Data Name="DfsNamespace">Documents</Data>
    <Data Name="SyncFromPDC">false</Data>
    <Data Name="SyncType">3</Data>
  </EventData>
</Event>