Specifying the timeout for the _msearch in the body (#26446) (#26534)

* Specifying the timeout for the msearch in the body

* Revert "Specifying the timeout for the msearch in the body"

This reverts commit 7b07bfa2e6.

* Fixing the courier and the index pattern execute script timeouts

src/ui/public/courier/fetch/request/serialize_fetch_params/serialize_fetch_params.js

@@ -72,7 +72,10 @@ export function serializeFetchParams(
         });
       })
       .then(function (indexList) {
-        let body = fetchParams.body || {};
+        let body = {
+          timeout: `${esShardTimeout}ms`,
+          ...fetchParams.body || {},
+        };
         let index = [];
         // If we've reached this point and there are no indexes in the
         // index list at all, it means that we shouldn't expect any indexes
@@ -94,7 +97,6 @@ export function serializeFetchParams(
           type: fetchParams.type,
           search_type: fetchParams.search_type,
           ignore_unavailable: true,
-          timeout: esShardTimeout,
         };
         if (config.get('courier:setRequestPreference') === 'sessionId') {
           header.preference = sessionId;

src/ui/public/field_editor/lib/validate_script.js

@@ -24,7 +24,6 @@ export const executeScript = async ({ name, lang, script, indexPatternTitle, add
   const header = {
     index: indexPatternTitle,
     ignore_unavailable: true,
-    timeout: 30000
   };
 
   const search = {
@@ -40,6 +39,7 @@ export const executeScript = async ({ name, lang, script, indexPatternTitle, add
       }
     },
     size: 10,
+    timeout: '30s',
   };
 
   if (additionalFields.length > 0) {