Add changelog entry and fix license headers

Signed-off-by: Thomas Farr <tsfarr@amazon.com>

CHANGELOG.md

@@ -7,6 +7,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ### Added
 - Added support for `MinScore` on `ScriptScoreQuery` ([#624](https://github.com/opensearch-project/opensearch-net/pull/624))
+- Added support for the `neural` query type and `text_embedding` ingest processor type ([#636](https://github.com/opensearch-project/opensearch-net/pull/636))
 - Added support for the `Cat.PitSegments` and `Cat.SegmentReplication` APIs ([#527](https://github.com/opensearch-project/opensearch-net/pull/527))
 
 ### Removed
@@ -184,4 +185,4 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 [1.6.0]: https://github.com/opensearch-project/opensearch-net/compare/v1.5.0...v1.6.0
 [1.5.0]: https://github.com/opensearch-project/opensearch-net/compare/v1.4.0...v1.5.0
 [1.4.0]: https://github.com/opensearch-project/opensearch-net/compare/v1.3.0...v1.4.0
-[1.3.0]: https://github.com/opensearch-project/opensearch-net/compare/v1.2.0...v1.3.0
+[1.3.0]: https://github.com/opensearch-project/opensearch-net/compare/v1.2.0...v1.3.0

src/OpenSearch.Client/Ingest/Processors/Plugins/NeuralSearch/InferenceProcessorBase.cs

@@ -1,3 +1,10 @@
+/* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 using System;
 using System.Collections.Generic;
 using System.Linq.Expressions;

src/OpenSearch.Client/Ingest/Processors/Plugins/NeuralSearch/TextEmbeddingProcessor.cs

@@ -1,3 +1,10 @@
+/* SPDX-License-Identifier: Apache-2.0
+*
+* The OpenSearch Contributors require contributions made to
+* this file be licensed under the Apache-2.0 license or a
+* compatible open source license.
+*/
+
 using OpenSearch.Net.Utf8Json;
 
 namespace OpenSearch.Client;