DisableExplicitConversion:
When this property is set to true, the TO_CHAR and LCASE functions are not included in the SQL queries for View Submitted Tasks/View My Submitted Tasks. This eliminates the table level conversion for TO_CHAR and LCASE functions and improves the query performance, but the search is case sensitive.When this property is not set or set to false, the SQL query includes TO_CHAR and LCASE functions. You may experience some slowness in the execution of the SQL queries for View Submitted Tasks/View My Submitted Tasks, as it performs table level conversion for TO_CHAR and LCASE functions.
Please refer the doc for further explanation of the property
https://techdocs.broadcom.com/us/en/symantec-security-software/identity-security/identity-manager/14-4/configuring/advanced-settings/business-logic/miscellaneous-properties.html