Add documentation for search_idle_reactivate_count_total (#8986) (#8995)

_api-reference/nodes-apis/nodes-stats.md

@@ -206,6 +206,7 @@ Select the arrow to view the example response.
           "suggest_total": 0,
           "suggest_time_in_millis": 0,
           "suggest_current": 0,
+          "search_idle_reactivate_count_total": 0,
           "request" : {
             "dfs_pre_query" : {
               "time_in_millis" : 0,
@@ -892,6 +893,7 @@ search.point_in_time_current | Integer | The number of shard PIT contexts curren
 search.suggest_total | Integer | The total number of shard suggest operations.
 search.suggest_time_in_millis | Integer | The total amount of time for all shard suggest operations, in milliseconds.
 search.suggest_current | Integer | The number of shard suggest operations that are currently running.
+search.search_idle_reactivate_count_total | Integer | The total number of times that all shards have been activated from an idle state.
 search.request | Object | Statistics about coordinator search operations for the node.
 search.request.took.time_in_millis | Integer | The total amount of time taken for all search requests, in milliseconds.
 search.request.took.current | Integer | The number of search requests that are currently running.