Bootstrap initial versions to simplify transport version migration (elastic#134084)

This reverts our other bootstrapping of file-based transport versions
to make migration simpler moving forward and adds the initial version
one prior to the last initial version for each of 9.1, 9.0, 8.19, and 8.18.

Author: jdconrad

server/src/main/java/org/elasticsearch/TransportVersions.java

@@ -175,6 +175,7 @@ static TransportVersion def(int id) {
     public static final TransportVersion ESQL_SKIP_ES_INDEX_SERIALIZATION = def(8_827_0_00);
     public static final TransportVersion ADD_INDEX_BLOCK_TWO_PHASE = def(8_828_0_00);
     public static final TransportVersion RESOLVE_CLUSTER_NO_INDEX_EXPRESSION = def(8_829_0_00);
+    public static final TransportVersion ML_ROLLOVER_LEGACY_INDICES = def(8_830_0_00);
     public static final TransportVersion ADD_INCLUDE_FAILURE_INDICES_OPTION = def(8_831_0_00);
     public static final TransportVersion ESQL_RESPONSE_PARTIAL = def(8_832_0_00);
     public static final TransportVersion RANK_DOC_OPTIONAL_METADATA_FOR_EXPLAIN = def(8_833_0_00);
@@ -191,7 +192,6 @@ static TransportVersion def(int id) {
     public static final TransportVersion INITIAL_ELASTICSEARCH_8_18_2 = def(8_840_0_04);
     public static final TransportVersion INITIAL_ELASTICSEARCH_8_18_3 = def(8_840_0_05);
     public static final TransportVersion INITIAL_ELASTICSEARCH_8_18_4 = def(8_840_0_06);
-    public static final TransportVersion INITIAL_ELASTICSEARCH_8_18_6 = def(8_840_0_08);
     public static final TransportVersion INITIAL_ELASTICSEARCH_8_18_7 = def(8_840_0_09);
     public static final TransportVersion INITIAL_ELASTICSEARCH_8_19 = def(8_841_0_00);
     public static final TransportVersion COHERE_BIT_EMBEDDING_TYPE_SUPPORT_ADDED_BACKPORT_8_X = def(8_841_0_01);
@@ -256,10 +256,10 @@ static TransportVersion def(int id) {
     public static final TransportVersion ML_INFERENCE_COHERE_API_VERSION_8_19 = def(8_841_0_60);
     public static final TransportVersion ESQL_DOCUMENTS_FOUND_AND_VALUES_LOADED_8_19 = def(8_841_0_61);
     public static final TransportVersion ESQL_PROFILE_INCLUDE_PLAN_8_19 = def(8_841_0_62);
+    public static final TransportVersion ESQL_SPLIT_ON_BIG_VALUES_8_19 = def(8_841_0_63);
     public static final TransportVersion ESQL_FIXED_INDEX_LIKE_8_19 = def(8_841_0_64);
     public static final TransportVersion INITIAL_ELASTICSEARCH_8_19_1 = def(8_841_0_65);
     public static final TransportVersion INITIAL_ELASTICSEARCH_8_19_2 = def(8_841_0_66);
-    public static final TransportVersion INITIAL_ELASTICSEARCH_8_19_3 = def(8_841_0_67);
     public static final TransportVersion INITIAL_ELASTICSEARCH_8_19_4 = def(8_841_0_68);
 
     /*

server/src/main/resources/transport/definitions/referable/esql_split_on_big_values.csv

@@ -0,0 +1 @@
+8840008

server/src/main/resources/transport/definitions/referable/ml_rollover_legacy_indices.csv

@@ -0,0 +1 @@
+8841067

server/src/main/resources/transport/definitions/unreferable/initial_elasticsearch_8_18_6.csv

@@ -1 +1 @@
-initial_elasticsearch_8_18_5,8840007
+initial_elasticsearch_8_18_6,8840008

server/src/main/resources/transport/definitions/unreferable/initial_elasticsearch_8_19_3.csv

@@ -1 +1 @@
-esql_split_on_big_values,8841063
+initial_elasticsearch_8_19_3,8841067