diff --git a/specification/cognitiveservices/data-plane/TextAnalytics/preview/v3.1-preview.4/TextAnalytics.json b/specification/cognitiveservices/data-plane/TextAnalytics/preview/v3.1-preview.4/TextAnalytics.json
index 1cb151752541..6d1d51acb4ca 100644
--- a/specification/cognitiveservices/data-plane/TextAnalytics/preview/v3.1-preview.4/TextAnalytics.json
+++ b/specification/cognitiveservices/data-plane/TextAnalytics/preview/v3.1-preview.4/TextAnalytics.json
@@ -443,8 +443,8 @@
     },
     "/entities/linking": {
       "post": {
-        "summary": "Linked entities from a well-known knowledge base",
-        "description": "The API returns a list of recognized entities with links to a well-known knowledge base. See the <a href=\"https://aka.ms/talangs\">Supported languages in Text Analytics API</a> for the list of enabled languages.",
+        "summary": "Linked entities from a well known knowledge base",
+        "description": "The API returns a list of recognized entities with links to a well known knowledge base. See the <a href=\"https://aka.ms/talangs\">Supported languages in Text Analytics API</a> for the list of enabled languages.",
         "operationId": "EntitiesLinking",
         "consumes": [
           "application/json",
@@ -470,7 +470,7 @@
         ],
         "responses": {
           "200": {
-            "description": "A successful call results in a list of recognized entities with links to a well-known knowledge base returned for each valid document",
+            "description": "A successful call results in a list of recognized entities with links to a well known knowledge base returned for each valid document",
             "schema": {
               "$ref": "#/definitions/EntityLinkingResult"
             }
@@ -694,7 +694,7 @@
                 "$ref": "#/definitions/KeyPhrasesTask"
               }
             },
-            "EntityLinkingTasks": {
+            "entityLinkingTasks": {
               "type": "array",
               "items": {
                 "$ref": "#/definitions/EntityLinkingTask"
@@ -1676,7 +1676,7 @@
         },
         "entities": {
           "type": "array",
-          "description": "Recognized well-known entities in the document.",
+          "description": "Recognized well known entities in the document.",
           "items": {
             "$ref": "#/definitions/LinkedEntity"
           }
@@ -1970,7 +1970,7 @@
         "confidenceScore": {
           "type": "number",
           "format": "double",
-          "description": "If a well-known item is recognized, a decimal number denoting the confidence level between 0 and 1 will be returned."
+          "description": "If a well known item is recognized, a decimal number denoting the confidence level between 0 and 1 will be returned."
         },
         "text": {
           "type": "string",
@@ -2313,7 +2313,7 @@
       ],
       "x-ms-enum": {
         "name": "StringIndexTypeResponse",
-        "modelAsString": false,
+        "modelAsString": true,
         "values": [
           {
             "value": "TextElements_v8",
@@ -2385,7 +2385,7 @@
         "enum": ["ABARoutingNumber", "ARNationalIdentityNumber", "AUBankAccountNumber", "AUDriversLicenseNumber", "AUMedicalAccountNumber", "AUPassportNumber", "AUTaxFileNumber", "AUBusinessNumber", "AUCompanyNumber", "ATIdentityCard", "ATTaxIdentificationNumber", "ATValueAddedTaxNumber", "AzureDocumentDBAuthKey", "AzureIAASDatabaseConnectionandSQLString", "AzureIoTConnectionString", "AzurePublishSettingPassword", "AzureRedisCacheString", "AzureSAS", "AzureServiceBusString", "AzureStorageAccountKey", "AzureStorageAccountGeneric", "BENationalNumber", "BENationalNumberV2", "BEValueAddedTaxNumber", "BRCPFNumber", "BRLegalEntityNumber", "BRNationalIDRG", "BGUniformCivilNumber", "CABankAccountNumber", "CADriversLicenseNumber", "CAHealthServiceNumber", "CAPassportNumber", "CAPersonalHealthIdentification", "CASocialInsuranceNumber", "CLIdentityCardNumber", "CNResidentIdentityCardNumber", "CreditCardNumber", "HRIdentityCardNumber", "HRNationalIDNumber", "HRPersonalIdentificationNumber", "HRPersonalIdentificationOIBNumberV2", "CYIdentityCard", "CYTaxIdentificationNumber", "CZPersonalIdentityNumber", "CZPersonalIdentityV2", "DKPersonalIdentificationNumber", "DKPersonalIdentificationV2", "DrugEnforcementAgencyNumber", "EEPersonalIdentificationCode", "EUDebitCardNumber", "EUDriversLicenseNumber", "EUGPSCoordinates", "EUNationalIdentificationNumber", "EUPassportNumber", "EUSocialSecurityNumber", "EUTaxIdentificationNumber", "FIEuropeanHealthNumber", "FINationalID", "FINationalIDV2", "FIPassportNumber", "FRDriversLicenseNumber", "FRHealthInsuranceNumber", "FRNationalID", "FRPassportNumber", "FRSocialSecurityNumber", "FRTaxIdentificationNumber", "FRValueAddedTaxNumber", "DEDriversLicenseNumber", "DEPassportNumber", "DEIdentityCardNumber", "DETaxIdentificationNumber", "DEValueAddedNumber", "GRNationalIDCard", "GRNationalIDV2", "GRTaxIdentificationNumber", "HKIdentityCardNumber", "HUValueAddedNumber", "HUPersonalIdentificationNumber", "HUTaxIdentificationNumber", "INPermanentAccount", "INUniqueIdentificationNumber", "IDIdentityCardNumber", "InternationlBankingAccountNumber", "IEPersonalPublicServiceNumber", "IEPersonalPublicServiceNumberV2", "ILBankAccountNumber", "ILNationalID", "ITDriversLicenseNumber", "ITFiscalCode", "ITValueAddedTaxNumber", "JPBankAccountNumber", "JPDriversLicenseNumber", "JPPassportNumber", "JPResidentRegistrationNumber", "JPSocialInsuranceNumber", "JPMyNumberCorporate", "JPMyNumberPersonal", "JPResidenceCardNumber", "LVPersonalCode", "LTPersonalCode", "LUNationalIdentificationNumberNatural", "LUNationalIdentificationNumberNonNatural", "MYIdentityCardNumber", "MAIdentityCardNumber", "MTTaxIDNumber", "NLCitizensServiceNumber", "NLCitizensServiceNumberV2", "NLTaxIdentificationNumber", "NLValueAddedTaxNumber", "NZBankAccountNumber", "NZDriversLicenseNumber", "NZInlandRevenueNumber", "NZMinistryOfHealthNumber", "NZSocialWelfareNumber", "NOIdentityNumber", "PHUnifiedMultiPurposeIDNumber", "PLIdentityCard", "PLNationalID", "PLNationalIDV2", "PLPassportNumber", "PLTaxIdentificationNumber", "PLREGONNumber", "PTCitizenCardNumber", "PTCitizenCardNumberV2", "PTTaxIdentificationNumber", "ROPersonalNumericalCode", "RUPassportNumberDomestic", "RUPassportNumberInternational", "SANationalID", "SGNationalRegistrationIdentityCardNumber", "SKPersonalNumber", "SITaxIdentificationNumber", "SIUniqueMasterCitizenNumber", "ZAIdentificationNumber", "KRResidentRegistrationNumber", "ESDNI", "ESSocialSecurityNumber", "ESTaxIdentificationNumber", "SQLServerConnectionString", "SENationalID", "SENationalIDV2", "SEPassportNumber", "SETaxIdentificationNumber", "SWIFTCode", "CHSocialSecurityNumber", "TWNationalID", "TWPassportNumber", "TWResidentCertificate", "THPopulationIdentificationCode", "TRNationalIdentificationnumber", "UKDriversLicenseNumber", "UKElectoralRollNumber", "UKNationalHealthNumber", "UKNationalInsuranceNumber", "UKUniqueTaxpayerNumber", "USUKPassportNumber", "USBankAccountNumber", "USDriversLicenseNumber", "USIndividualTaxpayerIdentification", "USSocialSecurityNumber", "UAPassportNumberDomestic", "UAPassportNumberInternational", "Organization", "Email", "URL", "Age", "PhoneNumber", "IPAddress", "Date", "Person", "Address", "All", "Default"]
       },
       "name": "piiCategories",
-      "default": ["Default"],
+      "default": "Default",
       "required": false,
       "type": "array",
       "uniqueItems": true,