propgating retrievers to inner retrievers

Author: mridula-s109

x-pack/plugin/rank-rrf/src/main/java/org/elasticsearch/xpack/rank/linear/LinearRetrieverBuilder.java

@@ -199,6 +199,7 @@ public void doToXContent(XContentBuilder builder, Params params) throws IOExcept
                 builder.field(LinearRetrieverComponent.WEIGHT_FIELD.getPreferredName(), weights[index]);
                 builder.field(LinearRetrieverComponent.NORMALIZER_FIELD.getPreferredName(), normalizers[index].getName());
                 builder.endObject();
+                entry.retriever.minScore(this.minScore);
                 index++;
             }
             builder.endArray();