wip reranker interface

# Conflicts:
#	server/src/main/java/org/elasticsearch/inference/InferenceService.java

Author: davidkyle

server/src/main/java/org/elasticsearch/inference/RerankingInferenceService.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.inference;
+
+public interface RerankingInferenceService {
+
+    /**
+     * The reranking model's max window or an approximation of
+     * measured in the number of words.
+     * @return Window size in words
+     */
+    int rerankerWindowSize();
+}