field_caps: adapt bwc version after backport (#41427)

build.gradle

@@ -162,8 +162,8 @@ task verifyVersions {
  * after the backport of the backcompat code is complete.
  */
 
-boolean bwc_tests_enabled = true
-final String bwc_tests_disabled_issue = "" /* place a PR link here when committing bwc changes */
+boolean bwc_tests_enabled = false
+final String bwc_tests_disabled_issue = "https://github.com/elastic/elasticsearch/pull/41426" /* place a PR link here when committing bwc changes */
 if (bwc_tests_enabled == false) {
   if (bwc_tests_disabled_issue.isEmpty()) {
     throw new GradleException("bwc_tests_disabled_issue must be set when bwc_tests_enabled == false")

rest-api-spec/src/main/resources/rest-api-spec/test/field_caps/10_basic.yml

@@ -298,7 +298,7 @@ setup:
 ---
 "Field caps with include_unmapped":
   - skip:
-      version: " - 7.99.99"
+      version: " - 7.0.99"
       reason: include_unmapped has been added in 7.1.0
 
   - do:

server/src/main/java/org/elasticsearch/action/fieldcaps/FieldCapabilitiesRequest.java

@@ -84,7 +84,7 @@ public final class FieldCapabilitiesRequest extends ActionRequest implements Ind
         indices = in.readStringArray();
         indicesOptions = IndicesOptions.readIndicesOptions(in);
         mergeResults = in.readBoolean();
-        if (in.getVersion().onOrAfter(Version.V_8_0_0)) {
+        if (in.getVersion().onOrAfter(Version.V_7_1_0)) {
             includeUnmapped = in.readBoolean();
         } else {
             includeUnmapped = false;
@@ -98,7 +98,7 @@ public final class FieldCapabilitiesRequest extends ActionRequest implements Ind
         out.writeStringArray(indices);
         indicesOptions.writeIndicesOptions(out);
         out.writeBoolean(mergeResults);
-        if (out.getVersion().onOrAfter(Version.V_8_0_0)) {
+        if (out.getVersion().onOrAfter(Version.V_7_1_0)) {
             out.writeBoolean(includeUnmapped);
         }
     }

server/src/main/java/org/elasticsearch/action/fieldcaps/FieldCapabilitiesResponse.java

@@ -108,7 +108,7 @@ public class FieldCapabilitiesResponse extends ActionResponse implements ToXCont
     @Override
     public void readFrom(StreamInput in) throws IOException {
         super.readFrom(in);
-        if (in.getVersion().onOrAfter(Version.V_8_0_0)) {
+        if (in.getVersion().onOrAfter(Version.V_7_1_0)) {
             indices = in.readStringArray();
         } else {
             indices = Strings.EMPTY_ARRAY;
@@ -124,7 +124,7 @@ public class FieldCapabilitiesResponse extends ActionResponse implements ToXCont
     @Override
     public void writeTo(StreamOutput out) throws IOException {
         super.writeTo(out);
-        if (out.getVersion().onOrAfter(Version.V_8_0_0)) {
+        if (out.getVersion().onOrAfter(Version.V_7_1_0)) {
             out.writeStringArray(indices);
         }
         out.writeMap(responseMap, StreamOutput::writeString, FieldCapabilitiesResponse::writeField);