Merge branch 'master' into jdk-11-compiler

* master: (25 commits)
  [DOCS] Synchronize location of Breaking Changes (elastic#33588)
  [DOCS] Synchronizes captialization in top-level titles (elastic#33605)
  [SQL] Clean up LogicalPlanBuilder#doJoin (elastic#34048)
  Fix remote cluster seeds fallback (elastic#34090)
  [ML][HLRC] Replace REST-based ML test cleanup with the ML client (elastic#34109)
  Handle MatchNoDocsQuery in span query wrappers (elastic#34106)
  Update MovAvgIT AwaitsFix bug url
  Bad regex in CORS settings should throw a nicer error (elastic#34035)
  [HLRC] Support for role mapper expression dsl (elastic#33745)
  Watcher: Reduce script cache churn by checking for mustache tags (elastic#33978)
  Fold EngineSearcher into Engine.Searcher (elastic#34082)
  Mute SpanMultiTermQueryBuilderTests#testToQuery
  TESTS: Enable DEBUG Logging in Flaky Test (elastic#34091)
  TEST: Add engine is closed as expected failure msg
  Adjust bwc version for max_seq_no_of_updates
  Build DocStats from SegmentInfos in ReadOnlyEngine (elastic#34079)
  When creating wildcard queries, use MatchNoDocsQuery when the field type doesn't exist. (elastic#34093)
  [DOCS] Moves graph to docs folder (elastic#33472)
  Mute MovAvgIT#testHoltWintersNotEnoughData
  Security: use default scroll keepalive (elastic#33639)
  ...

client/rest-high-level/src/main/java/org/elasticsearch/client/security/support/expressiondsl/RoleMapperExpression.java

@@ -0,0 +1,30 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.client.security.support.expressiondsl;
+
+import org.elasticsearch.common.xcontent.ToXContentObject;
+
+/**
+ * Implementations of this interface represent an expression used for user role mapping
+ * that can later be resolved to a boolean value.
+ */
+public interface RoleMapperExpression extends ToXContentObject {
+
+}

client/rest-high-level/src/main/java/org/elasticsearch/client/security/support/expressiondsl/expressions/AllRoleMapperExpression.java

@@ -0,0 +1,55 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.client.security.support.expressiondsl.expressions;
+
+import org.elasticsearch.client.security.support.expressiondsl.RoleMapperExpression;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * An expression that evaluates to <code>true</code> if-and-only-if all its children
+ * evaluate to <code>true</code>.
+ * An <em>all</em> expression with no children is always <code>true</code>.
+ */
+public final class AllRoleMapperExpression extends CompositeRoleMapperExpression {
+
+    private AllRoleMapperExpression(String name, RoleMapperExpression[] elements) {
+        super(name, elements);
+    }
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static final class Builder {
+        private List<RoleMapperExpression> elements = new ArrayList<>();
+
+        public Builder addExpression(final RoleMapperExpression expression) {
+            assert expression != null : "expression cannot be null";
+            elements.add(expression);
+            return this;
+        }
+
+        public AllRoleMapperExpression build() {
+            return new AllRoleMapperExpression(CompositeType.ALL.getName(), elements.toArray(new RoleMapperExpression[0]));
+        }
+    }
+}

client/rest-high-level/src/main/java/org/elasticsearch/client/security/support/expressiondsl/expressions/AnyRoleMapperExpression.java

@@ -0,0 +1,55 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.client.security.support.expressiondsl.expressions;
+
+import org.elasticsearch.client.security.support.expressiondsl.RoleMapperExpression;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * An expression that evaluates to <code>true</code> if at least one of its children
+ * evaluate to <code>true</code>.
+ * An <em>any</em> expression with no children is never <code>true</code>.
+ */
+public final class AnyRoleMapperExpression extends CompositeRoleMapperExpression {
+
+    private AnyRoleMapperExpression(String name, RoleMapperExpression[] elements) {
+        super(name, elements);
+    }
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static final class Builder {
+        private List<RoleMapperExpression> elements = new ArrayList<>();
+
+        public Builder addExpression(final RoleMapperExpression expression) {
+            assert expression != null : "expression cannot be null";
+            elements.add(expression);
+            return this;
+        }
+
+        public AnyRoleMapperExpression build() {
+            return new AnyRoleMapperExpression(CompositeType.ANY.getName(), elements.toArray(new RoleMapperExpression[0]));
+        }
+    }
+}

client/rest-high-level/src/main/java/org/elasticsearch/client/security/support/expressiondsl/expressions/CompositeRoleMapperExpression.java

@@ -0,0 +1,100 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.client.security.support.expressiondsl.expressions;
+
+import org.elasticsearch.client.security.support.expressiondsl.RoleMapperExpression;
+import org.elasticsearch.common.xcontent.XContentBuilder;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * Expression of role mapper expressions which can be combined by operators like AND, OR
+ * <p>
+ * Expression builder example:
+ * <pre>
+ * {@code
+ * final RoleMapperExpression allExpression = AllRoleMapperExpression.builder()
+                    .addExpression(AnyRoleMapperExpression.builder()
+                            .addExpression(FieldRoleMapperExpression.ofUsername("user1@example.org"))
+                            .addExpression(FieldRoleMapperExpression.ofUsername("user2@example.org"))
+                            .build())
+                    .addExpression(FieldRoleMapperExpression.ofMetadata("metadata.location", "AMER"))
+                    .addExpression(new ExceptRoleMapperExpression(FieldRoleMapperExpression.ofUsername("user3@example.org")))
+                    .build();
+ * }
+ * </pre>
+ */
+public abstract class CompositeRoleMapperExpression implements RoleMapperExpression {
+    private final String name;
+    private final List<RoleMapperExpression> elements;
+
+    CompositeRoleMapperExpression(final String name, final RoleMapperExpression... elements) {
+        assert name != null : "field name cannot be null";
+        assert elements != null : "at least one field expression is required";
+        this.name = name;
+        this.elements = Collections.unmodifiableList(Arrays.asList(elements));
+    }
+
+    public String getName() {
+        return this.getName();
+    }
+
+    public List<RoleMapperExpression> getElements() {
+        return elements;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        final CompositeRoleMapperExpression that = (CompositeRoleMapperExpression) o;
+        if (Objects.equals(this.getName(), that.getName()) == false) {
+            return false;
+        }
+        return Objects.equals(this.getElements(), that.getElements());
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name, elements);
+    }
+
+    @Override
+    public XContentBuilder toXContent(final XContentBuilder builder, final Params params) throws IOException {
+        builder.startObject();
+        builder.startArray(name);
+        for (RoleMapperExpression e : elements) {
+            e.toXContent(builder, params);
+        }
+        builder.endArray();
+        return builder.endObject();
+    }
+
+}
+

client/rest-high-level/src/main/java/org/elasticsearch/client/security/support/expressiondsl/expressions/CompositeType.java

@@ -0,0 +1,59 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.client.security.support.expressiondsl.expressions;
+
+import org.elasticsearch.common.ParseField;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+public enum CompositeType {
+
+    ANY("any"), ALL("all"), EXCEPT("except");
+
+    private static Map<String, CompositeType> nameToType = Collections.unmodifiableMap(initialize());
+    private ParseField field;
+
+    CompositeType(String name) {
+        this.field = new ParseField(name);
+    }
+
+    public String getName() {
+        return field.getPreferredName();
+    }
+
+    public ParseField getParseField() {
+        return field;
+    }
+
+    public static CompositeType fromName(String name) {
+        return nameToType.get(name);
+    }
+
+    private static Map<String, CompositeType> initialize() {
+        Map<String, CompositeType> map = new HashMap<>();
+        for (CompositeType field : values()) {
+            map.put(field.getName(), field);
+        }
+        return map;
+    }
+
+}

client/rest-high-level/src/main/java/org/elasticsearch/client/security/support/expressiondsl/expressions/ExceptRoleMapperExpression.java

@@ -0,0 +1,47 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.client.security.support.expressiondsl.expressions;
+
+import org.elasticsearch.client.security.support.expressiondsl.RoleMapperExpression;
+import org.elasticsearch.common.xcontent.XContentBuilder;
+
+import java.io.IOException;
+
+/**
+ * A negating expression. That is, this expression evaluates to <code>true</code> if-and-only-if
+ * its delegate expression evaluate to <code>false</code>.
+ * Syntactically, <em>except</em> expressions are intended to be children of <em>all</em>
+ * expressions ({@link AllRoleMapperExpression}).
+ */
+public final class ExceptRoleMapperExpression extends CompositeRoleMapperExpression {
+
+    public ExceptRoleMapperExpression(final RoleMapperExpression expression) {
+        super(CompositeType.EXCEPT.getName(), expression);
+    }
+
+    @Override
+    public XContentBuilder toXContent(final XContentBuilder builder, final Params params) throws IOException {
+        builder.startObject();
+        builder.field(CompositeType.EXCEPT.getName());
+        builder.value(getElements().get(0));
+        return builder.endObject();
+    }
+
+}