Update opensearch-mixin/signals/search-and-index-overview.libsonnet

Co-authored-by: Keith Schmitt <[email protected]>

Author: postnati

opensearch-mixin/signals/search-and-index-overview.libsonnet

@@ -37,7 +37,7 @@ function(this)
         unit: 'ops',
         sources: {
           prometheus: {
-            expr: 'opensearch_index_search_fetch_current_number{%(queriesSelector)s, context=~"total"}',
+            expr: 'opensearch_index_search_fetch_current_number{%(queriesSelector)s, context="total"}',
             legendCustomTemplate: '{{index}} - fetch',
           },
         },