Convert server javadoc to html5 (#30279)

This commit converts the remaining javadocs in :server using html4 to html5.
This was mostly converting `tt` to `{@code}`.

buildSrc/src/main/groovy/org/elasticsearch/gradle/BuildPlugin.groovy

@@ -549,22 +549,6 @@ class BuildPlugin implements Plugin<Project> {
             javadoc.classpath = javadoc.getClasspath().filter { f ->
                 return classes.contains(f) == false
             }
-            /*
-             * Force html5 on projects that support it to silence the warning
-             * that `javadoc` will change its defaults in the future.
-             *
-             * But not all of our javadoc is actually valid html5. So we
-             * have to become valid incrementally. We only set html5 on the
-             * projects we have converted so that we still get the annoying
-             * warning on the unconverted ones. That will give us an
-             * incentive to convert them....
-             */
-            List html4Projects = [
-                ':server',
-            ]
-            if (false == html4Projects.contains(project.path)) {
-                javadoc.options.addBooleanOption('html5', true)
-            }
         }
         configureJavadocJar(project)
     }

buildSrc/src/main/groovy/org/elasticsearch/gradle/test/ClusterConfiguration.groovy

@@ -64,7 +64,7 @@ class ClusterConfiguration {
     boolean debug = false
 
     /**
-     * Configuration of the setting <tt>discovery.zen.minimum_master_nodes</tt> on the nodes.
+     * Configuration of the setting {@code discovery.zen.minimum_master_nodes} on the nodes.
      * In case of more than one node, this defaults to the number of nodes
      */
     @Input

server/src/main/java/org/apache/lucene/queries/ExtendedCommonTermsQuery.java

@@ -28,7 +28,7 @@
 
 /**
  * Extended version of {@link CommonTermsQuery} that allows to pass in a
- * <tt>minimumNumberShouldMatch</tt> specification that uses the actual num of high frequent terms
+ * {@code minimumNumberShouldMatch} specification that uses the actual num of high frequent terms
  * to calculate the minimum matching terms.
  */
 public class ExtendedCommonTermsQuery extends CommonTermsQuery {

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

@@ -668,7 +668,7 @@ protected String getExceptionName() {
     }
 
     /**
-     * Returns a underscore case name for the given exception. This method strips <tt>Elasticsearch</tt> prefixes from exception names.
+     * Returns a underscore case name for the given exception. This method strips {@code Elasticsearch} prefixes from exception names.
      */
     public static String getExceptionName(Throwable ex) {
         String simpleName = ex.getClass().getSimpleName();

server/src/main/java/org/elasticsearch/action/ShardOperationFailedException.java

@@ -31,12 +31,12 @@
 public interface ShardOperationFailedException extends Streamable, ToXContent {
 
     /**
-     * The index the operation failed on. Might return <tt>null</tt> if it can't be derived.
+     * The index the operation failed on. Might return {@code null} if it can't be derived.
      */
     String index();
 
     /**
-     * The index the operation failed on. Might return <tt>-1</tt> if it can't be derived.
+     * The index the operation failed on. Might return {@code -1} if it can't be derived.
      */
     int shardId();
 

server/src/main/java/org/elasticsearch/action/ThreadingModel.java

@@ -37,7 +37,7 @@ public byte id() {
     }
 
     /**
-     * <tt>true</tt> if the actual operation the action represents will be executed
+     * {@code true} if the actual operation the action represents will be executed
      * on a different thread than the calling thread (assuming it will be executed
      * on the same node).
      */
@@ -46,7 +46,7 @@ public boolean threadedOperation() {
     }
 
     /**
-     * <tt>true</tt> if the invocation of the action result listener will be executed
+     * {@code true} if the invocation of the action result listener will be executed
      * on a different thread (than the calling thread or an "expensive" thread, like the
      * IO thread).
      */

server/src/main/java/org/elasticsearch/action/admin/cluster/health/ClusterHealthResponse.java

@@ -123,7 +123,7 @@ public int getDelayedUnassignedShards() {
     }
 
     /**
-     * <tt>true</tt> if the waitForXXX has timeout out and did not match.
+     * {@code true} if the waitForXXX has timeout out and did not match.
      */
     public boolean isTimedOut() {
         return this.timedOut;

server/src/main/java/org/elasticsearch/action/admin/cluster/reroute/ClusterRerouteRequest.java

@@ -51,7 +51,7 @@ public ClusterRerouteRequest add(AllocationCommand... commands) {
     }
 
     /**
-     * Sets a dry run flag (defaults to <tt>false</tt>) allowing to run the commands without
+     * Sets a dry run flag (defaults to {@code false}) allowing to run the commands without
      * actually applying them to the cluster state, and getting the resulting cluster state back.
      */
     public ClusterRerouteRequest dryRun(boolean dryRun) {
@@ -78,7 +78,7 @@ public ClusterRerouteRequest explain(boolean explain) {
     }
 
     /**
-     * Sets the retry failed flag (defaults to <tt>false</tt>). If true, the
+     * Sets the retry failed flag (defaults to {@code false}). If true, the
      * request will retry allocating shards that can't currently be allocated due to too many allocation failures.
      */
     public ClusterRerouteRequest setRetryFailed(boolean retryFailed) {

server/src/main/java/org/elasticsearch/action/admin/cluster/reroute/ClusterRerouteRequestBuilder.java

@@ -42,7 +42,7 @@ public ClusterRerouteRequestBuilder add(AllocationCommand... commands) {
     }
 
     /**
-     * Sets a dry run flag (defaults to <tt>false</tt>) allowing to run the commands without
+     * Sets a dry run flag (defaults to {@code false}) allowing to run the commands without
      * actually applying them to the cluster state, and getting the resulting cluster state back.
      */
     public ClusterRerouteRequestBuilder setDryRun(boolean dryRun) {
@@ -51,7 +51,7 @@ public ClusterRerouteRequestBuilder setDryRun(boolean dryRun) {
     }
 
     /**
-     * Sets the explain flag (defaults to <tt>false</tt>). If true, the
+     * Sets the explain flag (defaults to {@code false}). If true, the
      * request will include an explanation in addition to the cluster state.
      */
     public ClusterRerouteRequestBuilder setExplain(boolean explain) {
@@ -60,7 +60,7 @@ public ClusterRerouteRequestBuilder setExplain(boolean explain) {
     }
 
     /**
-     * Sets the retry failed flag (defaults to <tt>false</tt>). If true, the
+     * Sets the retry failed flag (defaults to {@code false}). If true, the
      * request will retry allocating shards that can't currently be allocated due to too many allocation failures.
      */
     public ClusterRerouteRequestBuilder setRetryFailed(boolean retryFailed) {

server/src/main/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsRequest.java

@@ -146,7 +146,7 @@ public ClusterSearchShardsRequest routing(String... routings) {
 
     /**
      * Sets the preference to execute the search. Defaults to randomize across shards. Can be set to
-     * <tt>_local</tt> to prefer local shards or a custom value, which guarantees that the same order
+     * {@code _local} to prefer local shards or a custom value, which guarantees that the same order
      * will be used across different requests.
      */
     public ClusterSearchShardsRequest preference(String preference) {

server/src/main/java/org/elasticsearch/action/admin/cluster/shards/ClusterSearchShardsRequestBuilder.java

@@ -55,7 +55,7 @@ public ClusterSearchShardsRequestBuilder setRouting(String... routing) {
 
     /**
      * Sets the preference to execute the search. Defaults to randomize across shards. Can be set to
-     * <tt>_local</tt> to prefer local shards or a custom value, which guarantees that the same order
+     * {@code _local} to prefer local shards or a custom value, which guarantees that the same order
      * will be used across different requests.
      */
     public ClusterSearchShardsRequestBuilder setPreference(String preference) {

server/src/main/java/org/elasticsearch/action/admin/cluster/state/ClusterStateRequestBuilder.java

@@ -52,7 +52,7 @@ public ClusterStateRequestBuilder setBlocks(boolean filter) {
 
     /**
      * Should the cluster state result include the {@link org.elasticsearch.cluster.metadata.MetaData}. Defaults
-     * to <tt>true</tt>.
+     * to {@code true}.
      */
     public ClusterStateRequestBuilder setMetaData(boolean filter) {
         request.metaData(filter);
@@ -61,7 +61,7 @@ public ClusterStateRequestBuilder setMetaData(boolean filter) {
 
     /**
      * Should the cluster state result include the {@link org.elasticsearch.cluster.node.DiscoveryNodes}. Defaults
-     * to <tt>true</tt>.
+     * to {@code true}.
      */
     public ClusterStateRequestBuilder setNodes(boolean filter) {
         request.nodes(filter);
@@ -70,7 +70,7 @@ public ClusterStateRequestBuilder setNodes(boolean filter) {
 
     /**
      * Should the cluster state result include the {@link org.elasticsearch.cluster.ClusterState.Custom}. Defaults
-     * to <tt>true</tt>.
+     * to {@code true}.
      */
     public ClusterStateRequestBuilder setCustoms(boolean filter) {
         request.customs(filter);
@@ -79,7 +79,7 @@ public ClusterStateRequestBuilder setCustoms(boolean filter) {
 
     /**
      * Should the cluster state result include the {@link org.elasticsearch.cluster.routing.RoutingTable}. Defaults
-     * to <tt>true</tt>.
+     * to {@code true}.
      */
     public ClusterStateRequestBuilder setRoutingTable(boolean filter) {
         request.routingTable(filter);

server/src/main/java/org/elasticsearch/action/admin/indices/flush/FlushRequest.java

@@ -51,15 +51,15 @@ public FlushRequest(String... indices) {
     }
 
     /**
-     * Returns <tt>true</tt> iff a flush should block
-     * if a another flush operation is already running. Otherwise <tt>false</tt>
+     * Returns {@code true} iff a flush should block
+     * if a another flush operation is already running. Otherwise {@code false}
      */
     public boolean waitIfOngoing() {
         return this.waitIfOngoing;
     }
 
     /**
-     * if set to <tt>true</tt> the flush will block
+     * if set to {@code true} the flush will block
      * if a another flush operation is already running until the flush can be performed.
      * The default is <code>true</code>
      */

server/src/main/java/org/elasticsearch/action/admin/indices/forcemerge/ForceMergeRequest.java

@@ -27,7 +27,7 @@
 
 /**
  * A request to force merging the segments of one or more indices. In order to
- * run a merge on all the indices, pass an empty array or <tt>null</tt> for the
+ * run a merge on all the indices, pass an empty array or {@code null} for the
  * indices.
  * {@link #maxNumSegments(int)} allows to control the number of segments
  * to force merge down to. Defaults to simply checking if a merge needs
@@ -81,30 +81,30 @@ public ForceMergeRequest maxNumSegments(int maxNumSegments) {
 
     /**
      * Should the merge only expunge deletes from the index, without full merging.
-     * Defaults to full merging (<tt>false</tt>).
+     * Defaults to full merging ({@code false}).
      */
     public boolean onlyExpungeDeletes() {
         return onlyExpungeDeletes;
     }
 
     /**
      * Should the merge only expunge deletes from the index, without full merge.
-     * Defaults to full merging (<tt>false</tt>).
+     * Defaults to full merging ({@code false}).
      */
     public ForceMergeRequest onlyExpungeDeletes(boolean onlyExpungeDeletes) {
         this.onlyExpungeDeletes = onlyExpungeDeletes;
         return this;
     }
 
     /**
-     * Should flush be performed after the merge. Defaults to <tt>true</tt>.
+     * Should flush be performed after the merge. Defaults to {@code true}.
      */
     public boolean flush() {
         return flush;
     }
 
     /**
-     * Should flush be performed after the merge. Defaults to <tt>true</tt>.
+     * Should flush be performed after the merge. Defaults to {@code true}.
      */
     public ForceMergeRequest flush(boolean flush) {
         this.flush = flush;

server/src/main/java/org/elasticsearch/action/admin/indices/forcemerge/ForceMergeRequestBuilder.java

@@ -24,7 +24,7 @@
 
 /**
  * A request to force merge one or more indices. In order to force merge all
- * indices, pass an empty array or <tt>null</tt> for the indices.
+ * indices, pass an empty array or {@code null} for the indices.
  * {@link #setMaxNumSegments(int)} allows to control the number of segments to force
  * merge down to. By default, will cause the force merge process to merge down
  * to half the configured number of segments.
@@ -47,15 +47,15 @@ public ForceMergeRequestBuilder setMaxNumSegments(int maxNumSegments) {
 
     /**
      * Should the merge only expunge deletes from the index, without full merging.
-     * Defaults to full merging (<tt>false</tt>).
+     * Defaults to full merging ({@code false}).
      */
     public ForceMergeRequestBuilder setOnlyExpungeDeletes(boolean onlyExpungeDeletes) {
         request.onlyExpungeDeletes(onlyExpungeDeletes);
         return this;
     }
 
     /**
-     * Should flush be performed after the merge. Defaults to <tt>true</tt>.
+     * Should flush be performed after the merge. Defaults to {@code true}.
      */
     public ForceMergeRequestBuilder setFlush(boolean flush) {
         request.flush(flush);

server/src/main/java/org/elasticsearch/action/admin/indices/template/put/PutIndexTemplateRequest.java

@@ -154,7 +154,7 @@ public Integer version() {
     }
 
     /**
-     * Set to <tt>true</tt> to force only creation, not an update of an index template. If it already
+     * Set to {@code true} to force only creation, not an update of an index template. If it already
      * exists, it will fail with an {@link IllegalArgumentException}.
      */
     public PutIndexTemplateRequest create(boolean create) {

server/src/main/java/org/elasticsearch/action/admin/indices/template/put/PutIndexTemplateRequestBuilder.java

@@ -76,7 +76,7 @@ public PutIndexTemplateRequestBuilder setVersion(Integer version) {
     }
 
     /**
-     * Set to <tt>true</tt> to force only creation, not an update of an index template. If it already
+     * Set to {@code true} to force only creation, not an update of an index template. If it already
      * exists, it will fail with an {@link IllegalArgumentException}.
      */
     public PutIndexTemplateRequestBuilder setCreate(boolean create) {

server/src/main/java/org/elasticsearch/action/admin/indices/upgrade/post/UpgradeRequest.java

@@ -27,7 +27,7 @@
 
 /**
  * A request to upgrade one or more indices. In order to update all indices, pass an empty array or
- * <tt>null</tt> for the indices.
+ * {@code null} for the indices.
  * @see org.elasticsearch.client.Requests#upgradeRequest(String...)
  * @see org.elasticsearch.client.IndicesAdminClient#upgrade(UpgradeRequest)
  * @see UpgradeResponse
@@ -67,7 +67,7 @@ public void writeTo(StreamOutput out) throws IOException {
 
     /**
      * Should the upgrade only the ancient (older major version of Lucene) segments?
-     * Defaults to <tt>false</tt>.
+     * Defaults to {@code false}.
      */
     public boolean upgradeOnlyAncientSegments() {
         return upgradeOnlyAncientSegments;

server/src/main/java/org/elasticsearch/action/admin/indices/upgrade/post/UpgradeRequestBuilder.java

@@ -24,7 +24,7 @@
 
 /**
  * A request to upgrade one or more indices. In order to optimize on all the indices, pass an empty array or
- * <tt>null</tt> for the indices.
+ * {@code null} for the indices.
  */
 public class UpgradeRequestBuilder extends BroadcastOperationRequestBuilder<UpgradeRequest, UpgradeResponse, UpgradeRequestBuilder> {
 

server/src/main/java/org/elasticsearch/action/bulk/BulkItemResponse.java

@@ -407,7 +407,7 @@ public long getVersion() {
     }
 
     /**
-     * The actual response ({@link IndexResponse} or {@link DeleteResponse}). <tt>null</tt> in
+     * The actual response ({@link IndexResponse} or {@link DeleteResponse}). {@code null} in
      * case of failure.
      */
     public <T extends DocWriteResponse> T getResponse() {
@@ -422,7 +422,7 @@ public boolean isFailed() {
     }
 
     /**
-     * The failure message, <tt>null</tt> if it did not fail.
+     * The failure message, {@code null} if it did not fail.
      */
     public String getFailureMessage() {
         if (failure != null) {

server/src/main/java/org/elasticsearch/action/bulk/BulkProcessor.java

@@ -100,7 +100,7 @@ private Builder(BiConsumer<BulkRequest, ActionListener<BulkResponse>> consumer,
         /**
          * Sets the number of concurrent requests allowed to be executed. A value of 0 means that only a single
          * request will be allowed to be executed. A value of 1 means 1 concurrent request is allowed to be executed
-         * while accumulating new bulk requests. Defaults to <tt>1</tt>.
+         * while accumulating new bulk requests. Defaults to {@code 1}.
          */
         public Builder setConcurrentRequests(int concurrentRequests) {
             this.concurrentRequests = concurrentRequests;
@@ -109,7 +109,7 @@ public Builder setConcurrentRequests(int concurrentRequests) {
 
         /**
          * Sets when to flush a new bulk request based on the number of actions currently added. Defaults to
-         * <tt>1000</tt>. Can be set to <tt>-1</tt> to disable it.
+         * {@code 1000}. Can be set to {@code -1} to disable it.
          */
         public Builder setBulkActions(int bulkActions) {
             this.bulkActions = bulkActions;
@@ -118,7 +118,7 @@ public Builder setBulkActions(int bulkActions) {
 
         /**
          * Sets when to flush a new bulk request based on the size of actions currently added. Defaults to
-         * <tt>5mb</tt>. Can be set to <tt>-1</tt> to disable it.
+         * {@code 5mb}. Can be set to {@code -1} to disable it.
          */
         public Builder setBulkSize(ByteSizeValue bulkSize) {
             this.bulkSize = bulkSize;
@@ -129,7 +129,7 @@ public Builder setBulkSize(ByteSizeValue bulkSize) {
          * Sets a flush interval flushing *any* bulk actions pending if the interval passes. Defaults to not set.
          * <p>
          * Note, both {@link #setBulkActions(int)} and {@link #setBulkSize(org.elasticsearch.common.unit.ByteSizeValue)}
-         * can be set to <tt>-1</tt> with the flush interval set allowing for complete async processing of bulk actions.
+         * can be set to {@code -1} with the flush interval set allowing for complete async processing of bulk actions.
          */
         public Builder setFlushInterval(TimeValue flushInterval) {
             this.flushInterval = flushInterval;

server/src/main/java/org/elasticsearch/action/bulk/BulkRequest.java

@@ -493,15 +493,15 @@ public RefreshPolicy getRefreshPolicy() {
     }
 
     /**
-     * A timeout to wait if the index operation can't be performed immediately. Defaults to <tt>1m</tt>.
+     * A timeout to wait if the index operation can't be performed immediately. Defaults to {@code 1m}.
      */
     public final BulkRequest timeout(TimeValue timeout) {
         this.timeout = timeout;
         return this;
     }
 
     /**
-     * A timeout to wait if the index operation can't be performed immediately. Defaults to <tt>1m</tt>.
+     * A timeout to wait if the index operation can't be performed immediately. Defaults to {@code 1m}.
      */
     public final BulkRequest timeout(String timeout) {
         return timeout(TimeValue.parseTimeValue(timeout, null, getClass().getSimpleName() + ".timeout"));