Sets CPSMode(true) only if CPS is enabled and searchRequest is allowCrossProject (elastic#137011)

Author: piergm

server/src/main/java/org/elasticsearch/rest/action/search/RestSearchAction.java

@@ -245,7 +245,7 @@ public static void parseSearchRequest(
         searchRequest.routing(request.param("routing"));
         searchRequest.preference(request.param("preference"));
         IndicesOptions indicesOptions = IndicesOptions.fromRequest(request, searchRequest.indicesOptions());
-        if (crossProjectEnabled) {
+        if (crossProjectEnabled && searchRequest.allowsCrossProject()) {
             indicesOptions = IndicesOptions.builder(indicesOptions)
                 .crossProjectModeOptions(new IndicesOptions.CrossProjectModeOptions(true))
                 .build();