SourceOne: Email Management Index process crashes after installing 7.2.SP5 Hotfix Bundle 2

After installing SourceOne Email Management 7.2.SP5 Hotfix Bundle 2 (7.2.5.5133), several ISYS based full-text index sets gets marked with "Missing Items". 

Error messages similar to the following can be found in the "Application" event logs of the SourceOne Native Archive servers:
 

Log Name:      Application
Source:        Application Error
Date:         6/12/2017 1:41:19 PM
Event ID:     1000
Task Category: Application Crashing Events
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      HostName
Description:
Faulting application name: ExAsIdxObj.exe, version: 7.2.5.5133, time stamp: 0x59d50312
Faulting module name: ntdll.dll, version: 6.3.9600.18007, time stamp: 0x55c4bc8e
Exception code: 0xc0000374
Fault offset: 0x000e5904
Faulting process id: 0x3d8
Faulting application start time: 0x01d36e3ba220d233
Faulting application path: D:\EMC SourceOne\EXPBA\bin\ExAsIdxObj.exe
Faulting module path: C:\Windows\SYSTEM32\ntdll.dll
Report Id: efa74284-da2e-11e7-813e-005056a15901
Faulting package full name: 
Faulting package-relative application ID: 


Log Name: Application
Source: Application Error
Date: 6/12/2017 2:44:29 PM
Event ID: 1000
Task Category: Application Crashing Events
Level: Error
Keywords: Classic
User: N/A
Computer: HostName Description:
Faulting application name: ExAsIdxObj.exe, version: 7.2.5.5133, time stamp: 0x59d50312
Faulting module name: ISYSreadershd.dll, version: 11.4.0.2647, time stamp: 0x59cd7b8d
Exception code: 0xc0000409
Fault offset: 0x008a3c6d
Faulting process id: 0xf34
Faulting application start time: 0x01d3786b90bd0ceb
Faulting application path: D:\Program Files (x86)\EMC SourceOne\EXPBA\bin\ExAsIdxObj.exe
Faulting module path: D:\Program Files (x86)\EMC SourceOne\ExPBA\bin\Indexer11\ISYSreadershd.dll

This issue is resolved in Hotfix Bundles (HFBs) or Service Pack versions on or higher than SourceOne Email Management 7.26.6156 (7.2 SP6 GA). 
Hotfix Bundles and Service Pack kits are available for download from https://www.dell.com/support, Select 'Drivers & Downloads' to access the required software.

Hotfixes are only available for the most current patch or Service Pack versions of the product that were available when this problem was resolved.
When installing Hot Fix Bundles (HFBs), they must all be installed in the correct order for ALL fixes to be correctly applied.
Upgrade to the latest version of the SourceOne release, service pack, and Hot Fix Bundle to ensure that all resolved issues will be fixed.