Update README.md

Thanks indeed

Co-authored-by: Joe Adams <[email protected]>

README.md

@@ -162,7 +162,7 @@ Further Information
 | elasticsearch_indices_segments_memory_bytes                           | gauge     | 1           | Current memory size of segments in bytes
 | elasticsearch_indices_settings_stats_read_only_indices                | gauge     | 1           | Count of indices that have read_only_allow_delete=true
 | elasticsearch_indices_settings_total_fields                           | gauge     |             | Index setting value for index.mapping.total_fields.limit (total allowable mapped fields in a index)
-| elasticsearch_indices_settings_number_of_replicas                     | gauge     |             | Index setting value for index.number_of_replicas
+| elasticsearch_indices_settings_replicas                     | gauge     |             | Index setting value for index.replicas
 | elasticsearch_indices_shards_docs                                     | gauge     | 3           | Count of documents on this shard
 | elasticsearch_indices_shards_docs_deleted                             | gauge     | 3           | Count of deleted documents on each shard
 | elasticsearch_indices_store_size_bytes                                | gauge     | 1           | Current size of stored index data in bytes