chore: Add licence header

Signed-off-by: Darkheir <raphael.cohen@sekoia.io>

Author: Darkheir

quickwit/quickwit-query/src/elastic_query_dsl/prefix_query.rs

@@ -1,3 +1,17 @@
+// Copyright 2021-Present Datadog, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 use serde::Deserialize;
 
 use crate::elastic_query_dsl::ConvertibleToQueryAst;

quickwit/quickwit-query/src/elastic_query_dsl/wildcard_query.rs

@@ -1,3 +1,17 @@
+// Copyright 2021-Present Datadog, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 use serde::Deserialize;
 
 use crate::elastic_query_dsl::ConvertibleToQueryAst;