feat(opensearch): refactor global search querybuilder and add case insensitivity opensearch filters (#6476)

crates/analytics/src/search.rs

@@ -190,7 +190,17 @@ pub async fn search_results(
     search_params: Vec<AuthInfo>,
 ) -> CustomResult<GetSearchResponse, OpenSearchError> {
     let search_req = req.search_req;
-
+    if search_req.query.trim().is_empty()
+        && search_req
+            .filters
+            .as_ref()
+            .map_or(true, |filters| filters.is_all_none())
+    {
+        return Err(OpenSearchError::BadRequestError(
+            "Both query and filters are empty".to_string(),
+        )
+        .into());
+    }
     let mut query_builder = OpenSearchQueryBuilder::new(
         OpenSearchQuery::Search(req.index),
         search_req.query,