Update index.max_result_window error to point to search_after not scroll

Author: stefnestor

server/src/main/java/org/elasticsearch/search/DefaultSearchContext.java

@@ -360,7 +360,7 @@ public void preProcess() {
                         + maxResultWindow
                         + "] but was ["
                         + resultWindow
-                        + "]. See the scroll api for a more efficient way to request large data sets. "
+                        + "]. See the search_after parameter for a more efficient way to request large data sets. "
                         + "This limit can be set by changing the ["
                         + IndexSettings.MAX_RESULT_WINDOW_SETTING.getKey()
                         + "] index level setting."

server/src/test/java/org/elasticsearch/search/DefaultSearchContextTests.java

@@ -196,7 +196,7 @@ protected Engine.Searcher acquireSearcherInternal(String source) {
                     "Result window is too large, from + size must be less than or equal to:"
                         + " ["
                         + maxResultWindow
-                        + "] but was [310]. See the scroll api for a more efficient way to request large data sets. "
+                        + "] but was [310]. See the search_after parameter for a more efficient way to request large data sets. "
                         + "This limit can be set by changing the ["
                         + IndexSettings.MAX_RESULT_WINDOW_SETTING.getKey()
                         + "] index level setting."