Remove deprecated _time and _term sort orders (#39450)

Deprecated in 6.0, removed in 8.0

Author: polyfractal

rest-api-spec/src/main/resources/rest-api-spec/test/search.aggregation/10_histogram.yml

@@ -139,59 +139,4 @@ setup:
 
   - match: { aggregations.histo.buckets.3.doc_count: 1 }
 
----
-"Deprecated _time order":
-
-  - skip:
-      reason:  _time order deprecated in 6.0, replaced by _key
-      features: "warnings"
-
-  - do:
-      index:
-        index: test_1
-        id: 1
-        body: { "date" : "2016-01-01" }
-
-  - do:
-      index:
-        index: test_1
-        id: 2
-        body: { "date" : "2016-01-02" }
-
-  - do:
-      index:
-        index: test_1
-        id: 3
-        body: { "date" : "2016-02-01" }
-
-  - do:
-      index:
-        index: test_1
-        id: 4
-        body: { "date" : "2016-03-01" }
-
-  - do:
-      indices.refresh: {}
-
-  - do:
-      search:
-        rest_total_hits_as_int: true
-        body: { "aggs" : { "histo" : { "date_histogram" : { "field" : "date", "interval" : "month", "order" : { "_time" : "desc" } } } } }
-      warnings:
-        - "Deprecated aggregation order key [_time] used, replaced by [_key]"
-
-  - match: { hits.total: 4 }
-
-  - length: { aggregations.histo.buckets: 3 }
-
-  - match: { aggregations.histo.buckets.0.key_as_string: "2016-03-01T00:00:00.000Z" }
-
-  - match: { aggregations.histo.buckets.0.doc_count: 1 }
-
-  - match: { aggregations.histo.buckets.1.key_as_string: "2016-02-01T00:00:00.000Z" }
-
-  - match: { aggregations.histo.buckets.1.doc_count: 1 }
-
-  - match: { aggregations.histo.buckets.2.key_as_string: "2016-01-01T00:00:00.000Z" }
 
-  - match: { aggregations.histo.buckets.2.doc_count: 2 }

rest-api-spec/src/main/resources/rest-api-spec/test/search.aggregation/20_terms.yml

@@ -648,57 +648,6 @@ setup:
 
   - match: { aggregations.number_terms.buckets.2.doc_count: 1 }
 
----
-"Deprecated _term order":
-
-  - skip:
-      reason:  _term order deprecated in 6.0, replaced by _key
-      features: "warnings"
-
-  - do:
-      index:
-        index: test_1
-        id: 1
-        body: { "str": "abc" }
-
-  - do:
-      index:
-        index: test_1
-        id: 2
-        body: { "str": "abc" }
-
-  - do:
-      index:
-        index: test_1
-        id: 3
-        body: { "str": "bcd" }
-
-  - do:
-      indices.refresh: {}
-
-  - do:
-      search:
-        rest_total_hits_as_int: true
-        body: { "size" : 0, "aggs" : { "str_terms" : { "terms" : { "field" : "str", "order" :  { "_term" : "desc" } } } } }
-      warnings:
-        - "Deprecated aggregation order key [_term] used, replaced by [_key]"
-
-  - match: { hits.total: 3 }
-
-  - length: { aggregations.str_terms.buckets: 2 }
-
-  - match: { aggregations.str_terms.buckets.0.key: "bcd" }
-
-  - is_false: aggregations.str_terms.buckets.0.key_as_string
-
-  - match: { aggregations.str_terms.buckets.0.doc_count: 1 }
-
-  - match: { aggregations.str_terms.buckets.1.key: "abc" }
-
-  - is_false: aggregations.str_terms.buckets.1.key_as_string
-
-  - match: { aggregations.str_terms.buckets.1.doc_count: 2 }
-
 ---
 "Global ordinals are not loaded with the map execution hint":
 

server/src/main/java/org/elasticsearch/search/aggregations/InternalOrder.java

@@ -563,13 +563,7 @@ public static BucketOrder parseOrderParam(XContentParser parser) throws IOExcept
                 throw new ParsingException(parser.getTokenLocation(),
                     "Must specify at least one field for [order]");
             }
-            // _term and _time order deprecated in 6.0; replaced by _key
-            if ("_term".equals(orderKey) || "_time".equals(orderKey)) {
-                deprecationLogger.deprecated("Deprecated aggregation order key [{}] used, replaced by [_key]", orderKey);
-            }
             switch (orderKey) {
-                case "_term":
-                case "_time":
                 case "_key":
                     return orderAsc ? KEY_ASC : KEY_DESC;
                 case "_count":