2512400 - Error: Cannot commit object(s). Object "Lucene Index Engine" (ID: xxxx) is locked by session "????" (ID: xxx)

• BI Platform Support Tool (BIPST) Platform search report (KBA 2138275) shows that there are many objects stuck in Queue #5 (Delta index To Be Merged Queue). These objects appear to be stuck in this queue and none appear to be moving into queue #6.
  
  
• Platform Search Adaptive Processing Server (APS) logs show the following errors:
  
  

  com.crystaldecisions.sdk.occa.infostore.internal.InfoStoreException: Cannot commit object(s). Object "Lucene Index Engine" (ID: 4552) is locked by session "????" (ID: 22621139). Cannot commit object(s). Object "Lucene Index Engine" (ID: 4552) is locked by session "????" (ID: 22621139). Caught Exception during atomicExecute: Cannot commit object(s). Object "Lucene Index Engine" (ID: 4552) is locked by session "????" (ID: 22621139). removeNonExistentObjectsFromQueue: Exception message - Cannot commit object(s). Object "Lucene Index Engine" (ID: 4552) is locked by session "????" (ID: 22621139).

• SAP BusinessObjects Business Intelligence Platform 4.x (BI 4.0 / 4.1 / 4.2)
• Windows
• Linux / Unix 

KBA , BI-BIP-SCH , BI platform search , Problem