3332811 - "Fulltext index required but not activated" when activate ESH CDS based connectors, such as CDS ESH_S_BILLINGDOCUMENTREQUEST

You found the following ESH CDS based connectors have the status "Error While Preparing" in esh_dashboard:

    ESH_S_BILLINGDOCUMENTREQUEST   Error While Preparing
    ESH_S_BILLINGDOCUMENT                 Error While Preparing
    ESH_S_CAWRITEOFF                          Error While Preparing
    ESH_S_PRELIMBILLINGDOCUMENT      Error While Preparing

And when you try to activate the above connectors using esh_dashboard, or run the report ESH_CDSABAP_ACTIVATION, you got the error:
E    [ESH_ENG_CDSVAL_SRCH028]  Fulltext index required but not activated

• SAP BASIS Enterprise Search on SAP Netweaver 750
• SAP BASIS Enterprise Search on SAP S/4HANA

S/4 core, ESH_COCKPIT, SFW5, business function, SFW_BROWSER, SD_BIL_ESH_VBRP_ARKTX  , KBA , BC-EIM-ESH , NetWeaver Enterprise Search , Problem