Update Version value in Search SDK (#14694)

sdk/search/search-documents/src/searchClient.ts

@@ -65,7 +65,7 @@ export class SearchClient<T> implements IndexDocumentsClient<T> {
   /**
    * The API version to use when communicating with the service.
    */
-  public readonly apiVersion: string = "2020-06-30";
+  public readonly apiVersion: string = "2020-06-30-Preview";
 
   /**
    * The endpoint of the search service

sdk/search/search-documents/src/searchIndexClient.ts

@@ -56,7 +56,7 @@ export class SearchIndexClient {
   /**
    * The API version to use when communicating with the service.
    */
-  public readonly apiVersion: string = "2020-06-30";
+  public readonly apiVersion: string = "2020-06-30-Preview";
 
   /**
    * The endpoint of the search service

sdk/search/search-documents/src/searchIndexerClient.ts

@@ -55,7 +55,7 @@ export class SearchIndexerClient {
   /**
    * The API version to use when communicating with the service.
    */
-  public readonly apiVersion: string = "2020-06-30";
+  public readonly apiVersion: string = "2020-06-30-Preview";
 
   /**
    * The endpoint of the search service