add extended validation information

src/main/java/org/apache/lucene/search/PublicTermsFilter.java

@@ -93,4 +93,17 @@ public class PublicTermsFilter extends Filter {
         }
         return result;
     }
+
+    @Override
+    public String toString() {
+        StringBuilder builder = new StringBuilder();
+        for(Term term: terms) {
+            if(builder.length() > 0) {
+                builder.append(' ');
+            }
+            builder.append(term);
+        }
+        return builder.toString();
+    }
+
 }

src/main/java/org/elasticsearch/action/admin/indices/validate/query/QueryExplanation.java

@@ -0,0 +1,105 @@
+/*
+ * Licensed to ElasticSearch and Shay Banon 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.action.admin.indices.validate.query;
+
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.common.io.stream.StreamOutput;
+import org.elasticsearch.common.io.stream.Streamable;
+
+import java.io.IOException;
+
+/**
+ *
+ */
+public class QueryExplanation  implements Streamable {
+
+    private String index;
+    
+    private boolean valid;
+    
+    private String explanation;
+    
+    private String error;
+
+    QueryExplanation() {
+        
+    }
+    
+    public QueryExplanation(String index, boolean valid, String explanation, String error) {
+        this.index = index;
+        this.valid = valid;
+        this.explanation = explanation;
+        this.error = error;
+    }
+
+    public String index() {
+        return this.index;
+    }
+
+    public String getIndex() {
+        return index();
+    }
+
+    public boolean valid() {
+        return this.valid;
+    }
+
+    public boolean getValid() {
+        return valid();
+    }
+
+    public String error() {
+        return this.error;
+    }
+
+    public String getError() {
+        return error();
+    }
+
+    public String explanation() {
+        return this.explanation;
+    }
+
+    public String getExplanation() {
+        return explanation();
+    }
+
+    @Override
+    public void readFrom(StreamInput in) throws IOException {
+        index = in.readUTF();
+        valid = in.readBoolean();
+        explanation = in.readOptionalUTF();
+        error = in.readOptionalUTF();
+    }
+
+    @Override
+    public void writeTo(StreamOutput out) throws IOException {
+        out.writeUTF(index);
+        out.writeBoolean(valid);
+        out.writeOptionalUTF(explanation);
+        out.writeOptionalUTF(error);
+    }
+
+    public static QueryExplanation readQueryExplanation(StreamInput in)  throws IOException {
+        QueryExplanation exp = new QueryExplanation();
+        exp.readFrom(in);
+        return exp;
+    }
+}

src/main/java/org/elasticsearch/action/admin/indices/validate/query/ShardValidateQueryRequest.java

@@ -37,6 +37,8 @@ class ShardValidateQueryRequest extends BroadcastShardOperationRequest {
 
     private String[] types = Strings.EMPTY_ARRAY;
     
+    private boolean explain;
+
     @Nullable
     private String[] filteringAliases;
 
@@ -48,6 +50,7 @@ class ShardValidateQueryRequest extends BroadcastShardOperationRequest {
         super(index, shardId);
         this.querySource = request.querySource();
         this.types = request.types();
+        this.explain = request.explain();
         this.filteringAliases = filteringAliases;
     }
 
@@ -59,6 +62,10 @@ class ShardValidateQueryRequest extends BroadcastShardOperationRequest {
         return this.types;
     }
     
+    public boolean explain() {
+        return this.explain;
+    }
+
     public String[] filteringAliases() {
         return filteringAliases;
     }
@@ -82,6 +89,8 @@ class ShardValidateQueryRequest extends BroadcastShardOperationRequest {
                 filteringAliases[i] = in.readUTF();
             }
         }
+
+        explain = in.readBoolean();
     }
 
     @Override
@@ -101,5 +110,7 @@ class ShardValidateQueryRequest extends BroadcastShardOperationRequest {
         } else {
             out.writeVInt(0);
         }
+
+        out.writeBoolean(explain);
     }
 }

src/main/java/org/elasticsearch/action/admin/indices/validate/query/ShardValidateQueryResponse.java

@@ -34,19 +34,33 @@ class ShardValidateQueryResponse extends BroadcastShardOperationResponse {
 
     private boolean valid;
     
+    private String explanation;
+
+    private String error;
+    
     ShardValidateQueryResponse() {
 
     }
 
-    public ShardValidateQueryResponse(String index, int shardId, boolean valid) {
+    public ShardValidateQueryResponse(String index, int shardId, boolean valid, String explanation, String error) {
         super(index, shardId);
         this.valid = valid;
+        this.explanation = explanation;
+        this.error = error;
     }
 
-    boolean valid() {
+    public boolean valid() {
         return this.valid;
     }
     
+    public String explanation() {
+        return explanation;
+    }
+    
+    public String error() {
+        return error;
+    }
+
     @Override
     public void readFrom(StreamInput in) throws IOException {
         super.readFrom(in);

src/main/java/org/elasticsearch/action/admin/indices/validate/query/TransportValidateQueryAction.java

@@ -34,6 +34,7 @@ import org.elasticsearch.cluster.routing.ShardRouting;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.index.query.IndexQueryParserService;
+import org.elasticsearch.index.query.ParsedQuery;
 import org.elasticsearch.index.query.QueryParsingException;
 import org.elasticsearch.indices.IndicesService;
 import org.elasticsearch.threadpool.ThreadPool;
@@ -113,6 +114,7 @@ public class TransportValidateQueryAction extends TransportBroadcastOperationAct
         int failedShards = 0;
         boolean valid = true;
         List<ShardOperationFailedException> shardFailures = null;
+        List<QueryExplanation> queryExplanations = null;
         for (int i = 0; i < shardsResponses.length(); i++) {
             Object shardResponse = shardsResponses.get(i);
             if (shardResponse == null) {
@@ -124,29 +126,48 @@ public class TransportValidateQueryAction extends TransportBroadcastOperationAct
                 }
                 shardFailures.add(new DefaultShardOperationFailedException((BroadcastShardOperationFailedException) shardResponse));
             } else {
-                valid = valid && ((ShardValidateQueryResponse) shardResponse).valid();
+                ShardValidateQueryResponse validateQueryResponse = (ShardValidateQueryResponse) shardResponse;
+                valid = valid && validateQueryResponse.valid();
+                if(request.explain()) {
+                    if(queryExplanations == null) {
+                        queryExplanations = newArrayList();
+                    }
+                    queryExplanations.add(new QueryExplanation(
+                            validateQueryResponse.index(),
+                            validateQueryResponse.valid(),
+                            validateQueryResponse.explanation(),
+                            validateQueryResponse.error()
+                    ));
+                }
                 successfulShards++;
             }
         }
-        return new ValidateQueryResponse(valid, shardsResponses.length(), successfulShards, failedShards, shardFailures);
+        return new ValidateQueryResponse(valid, queryExplanations, shardsResponses.length(), successfulShards, failedShards, shardFailures);
     }
 
     @Override
     protected ShardValidateQueryResponse shardOperation(ShardValidateQueryRequest request) throws ElasticSearchException {
         IndexQueryParserService queryParserService = indicesService.indexServiceSafe(request.index()).queryParserService();
         boolean valid;
+        String explanation = null;
+        String error = null;
         if (request.querySource().length() == 0) {
             valid = true;
         } else {
             try {
-                queryParserService.parse(request.querySource().bytes(), request.querySource().offset(), request.querySource().length());
+                ParsedQuery parsedQuery = queryParserService.parse(request.querySource().bytes(), request.querySource().offset(), request.querySource().length());
                 valid = true;
+                if(request.explain()) {
+                    explanation = parsedQuery.query().toString();
+                }
             } catch (QueryParsingException e) {
                 valid = false;
+                error = e.getDetailedMessage();
             } catch (AssertionError e) {
                 valid = false;
+                error = e.getMessage();
             }
         }
-        return new ShardValidateQueryResponse(request.index(), request.shardId(), valid);
+        return new ShardValidateQueryResponse(request.index(), request.shardId(), valid, explanation, error);
     }
 }

src/main/java/org/elasticsearch/action/admin/indices/validate/query/ValidateQueryRequest.java

@@ -56,6 +56,8 @@ public class ValidateQueryRequest extends BroadcastOperationRequest {
     private int querySourceLength;
     private boolean querySourceUnsafe;
     
+    private boolean explain;
+
     private String[] types = Strings.EMPTY_ARRAY;
 
     ValidateQueryRequest() {
@@ -205,6 +207,20 @@ public class ValidateQueryRequest extends BroadcastOperationRequest {
         return this;
     }
 
+    /**
+     * Indicate if detailed information about query is requested
+     */
+    public void explain(boolean explain) {
+        this.explain = explain;
+    }
+
+    /**
+     * Indicates if detailed information about query is requested
+     */
+    public boolean explain() {
+        return explain;
+    }
+
     @Override
     public void readFrom(StreamInput in) throws IOException {
         super.readFrom(in);
@@ -222,6 +238,9 @@ public class ValidateQueryRequest extends BroadcastOperationRequest {
                 types[i] = in.readUTF();
             }
         }
+
+        explain = in.readBoolean();
+        
     }
 
     @Override
@@ -234,10 +253,12 @@ public class ValidateQueryRequest extends BroadcastOperationRequest {
         for (String type : types) {
             out.writeUTF(type);
         }
+        
+        out.writeBoolean(explain);
     }
 
     @Override
     public String toString() {
-        return "[" + Arrays.toString(indices) + "]" + Arrays.toString(types) + ", querySource[" + Unicode.fromBytes(querySource, querySourceOffset, querySourceLength) + "]";
+        return "[" + Arrays.toString(indices) + "]" + Arrays.toString(types) + ", querySource[" + Unicode.fromBytes(querySource, querySourceOffset, querySourceLength) + "], explain:" + explain;
     }
 }

src/main/java/org/elasticsearch/action/admin/indices/validate/query/ValidateQueryRequestBuilder.java

@@ -50,6 +50,16 @@ public class ValidateQueryRequestBuilder extends BaseIndicesRequestBuilder<Valid
         return this;
     }
 
+    /**
+     * Indicates if detailed information about the query should be returned.
+     *
+     * @see org.elasticsearch.index.query.QueryBuilders
+     */
+    public ValidateQueryRequestBuilder setExplain(boolean explain) {
+        request.explain(explain);
+        return this;
+    }
+
     /**
      * Controls the operation threading model.
      */

src/main/java/org/elasticsearch/action/admin/indices/validate/query/ValidateQueryResponse.java

@@ -19,14 +19,18 @@
 
 package org.elasticsearch.action.admin.indices.validate.query;
 
+import com.google.common.collect.ImmutableList;
 import org.elasticsearch.action.ShardOperationFailedException;
 import org.elasticsearch.action.support.broadcast.BroadcastOperationResponse;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.List;
 
+import static org.elasticsearch.action.admin.indices.validate.query.QueryExplanation.readQueryExplanation;
+
 /**
  * The response of the validate action.
  *
@@ -36,13 +40,19 @@ public class ValidateQueryResponse extends BroadcastOperationResponse {
 
     private boolean valid;
     
+    private List<QueryExplanation> queryExplanations;
+
     ValidateQueryResponse() {
 
     }
 
-    ValidateQueryResponse(boolean valid, int totalShards, int successfulShards, int failedShards, List<ShardOperationFailedException> shardFailures) {
+    ValidateQueryResponse(boolean valid, List<QueryExplanation> queryExplanations, int totalShards, int successfulShards, int failedShards, List<ShardOperationFailedException> shardFailures) {
         super(totalShards, successfulShards, failedShards, shardFailures);
         this.valid = valid;
+        this.queryExplanations = queryExplanations;
+        if (queryExplanations == null) {
+            this.queryExplanations = ImmutableList.of();
+        }
     }
 
     /**
@@ -59,15 +69,44 @@ public class ValidateQueryResponse extends BroadcastOperationResponse {
         return valid;
     }
 
+    /**
+     * The list of query explanations.
+     */
+    public List<? extends QueryExplanation> queryExplanations() {
+        if (queryExplanations == null) {
+            return ImmutableList.of();
+        }
+        return queryExplanations;
+    }
+
+    /**
+     * The list of query explanations.
+     */
+    public List<QueryExplanation> getQueryExplanation() {
+        return queryExplanations;
+    }
+
     @Override
     public void readFrom(StreamInput in) throws IOException {
         super.readFrom(in);
         valid = in.readBoolean();
+        int size = in.readVInt();
+        if (size > 0) {
+            queryExplanations = new ArrayList<QueryExplanation>(size);
+            for (int i = 0; i < size; i++) {
+                queryExplanations.add(readQueryExplanation(in));
+            }
+        }
     }
 
     @Override
     public void writeTo(StreamOutput out) throws IOException {
         super.writeTo(out);
         out.writeBoolean(valid);
+        out.writeVInt(queryExplanations.size());
+        for (QueryExplanation exp : queryExplanations) {
+            exp.writeTo(out);
+        }
+
     }
 }

src/main/java/org/elasticsearch/common/lucene/search/AndFilter.java

@@ -87,6 +87,19 @@ public class AndFilter extends Filter {
         return equalFilters(filters, other.filters);
     }
 
+    @Override
+    public String toString() {
+        StringBuilder builder = new StringBuilder();
+        for(Filter filter: filters) {
+            if(builder.length() > 0) {
+                builder.append(' ');
+            }
+            builder.append('+');
+            builder.append(filter);
+        }
+        return builder.toString();
+    }
+
     private boolean equalFilters(List<? extends Filter> filters1, List<? extends Filter> filters2) {
         return (filters1 == filters2) || ((filters1 != null) && filters1.equals(filters2));
     }

src/main/java/org/elasticsearch/common/lucene/search/NotFilter.java

@@ -65,6 +65,11 @@ public class NotFilter extends Filter {
         return !(filter != null ? !filter.equals(notFilter.filter) : notFilter.filter != null);
     }
 
+    @Override
+    public String toString() {
+        return "NotFilter(" + filter + ")";
+    }
+
     @Override
     public int hashCode() {
         return filter != null ? filter.hashCode() : 0;

src/main/java/org/elasticsearch/common/lucene/search/OrFilter.java

@@ -93,6 +93,18 @@ public class OrFilter extends Filter {
         return equalFilters(filters, other.filters);
     }
 
+    @Override
+    public String toString() {
+        StringBuilder builder = new StringBuilder();
+        for(Filter filter: filters) {
+            if(builder.length() > 0) {
+                builder.append(' ');
+            }
+            builder.append(filter);
+        }
+        return builder.toString();
+    }
+
     private boolean equalFilters(List<? extends Filter> filters1, List<? extends Filter> filters2) {
         return (filters1 == filters2) || ((filters1 != null) && filters1.equals(filters2));
     }

src/main/java/org/elasticsearch/index/search/UidFilter.java

@@ -33,10 +33,7 @@ import org.elasticsearch.index.mapper.Uid;
 import org.elasticsearch.index.mapper.internal.UidFieldMapper;
 
 import java.io.IOException;
-import java.util.Collection;
-import java.util.List;
-import java.util.Set;
-import java.util.TreeSet;
+import java.util.*;
 
 public class UidFilter extends Filter {
 
@@ -95,6 +92,11 @@ public class UidFilter extends Filter {
         return !uids.equals(uidFilter.uids);
     }
 
+    @Override
+    public String toString() {
+        return "UidFilter(" + uids + ")";
+    }
+
     @Override
     public int hashCode() {
         return uids.hashCode();

src/main/java/org/elasticsearch/index/search/geo/GeoDistanceFilter.java

@@ -137,6 +137,11 @@ public class GeoDistanceFilter extends Filter {
         return true;
     }
 
+    @Override
+    public String toString() {
+        return "GeoDistanceFilter(" + fieldName + ", "  + geoDistance + ", "  + distance + ", " + lat + ", " + lon + ")";
+    }
+
     @Override
     public int hashCode() {
         int result;

src/main/java/org/elasticsearch/index/search/geo/GeoDistanceRangeFilter.java

@@ -151,6 +151,11 @@ public class GeoDistanceRangeFilter extends Filter {
         return true;
     }
 
+    @Override
+    public String toString() {
+        return "GeoDistanceRangeFilter(" + fieldName + ", "  + geoDistance + ", ["  + inclusiveLowerPoint + " - " + inclusiveUpperPoint + "], " + lat + ", " + lon + ")";
+    }
+
     @Override
     public int hashCode() {
         int result;

src/main/java/org/elasticsearch/index/search/geo/GeoPolygonFilter.java

@@ -28,6 +28,7 @@ import org.elasticsearch.index.mapper.geo.GeoPointFieldData;
 import org.elasticsearch.index.mapper.geo.GeoPointFieldDataType;
 
 import java.io.IOException;
+import java.util.Arrays;
 
 /**
  *
@@ -60,6 +61,11 @@ public class GeoPolygonFilter extends Filter {
         return new GeoPolygonDocSet(reader.maxDoc(), fieldData, points);
     }
 
+    @Override
+    public String toString() {
+        return "GeoPolygonFilter(" + fieldName + ", "  + Arrays.toString(points) + ")";
+    }
+
     public static class GeoPolygonDocSet extends GetDocSet {
         private final GeoPointFieldData fieldData;
         private final Point[] points;

src/main/java/org/elasticsearch/index/search/geo/InMemoryGeoBoundingBoxFilter.java

@@ -73,6 +73,11 @@ public class InMemoryGeoBoundingBoxFilter extends Filter {
         }
     }
 
+    @Override
+    public String toString() {
+        return "GeoBoundingBoxFilter(" + fieldName + ", "  + topLeft + ", " + bottomRight + ")";
+    }
+
     public static class Meridian180GeoBoundingBoxDocSet extends GetDocSet {
         private final GeoPointFieldData fieldData;
         private final Point topLeft;

src/main/java/org/elasticsearch/rest/action/admin/indices/validate/query/RestValidateQueryAction.java

@@ -20,6 +20,7 @@
 package org.elasticsearch.rest.action.admin.indices.validate.query;
 
 import org.elasticsearch.action.ActionListener;
+import org.elasticsearch.action.admin.indices.validate.query.QueryExplanation;
 import org.elasticsearch.action.admin.indices.validate.query.ValidateQueryRequest;
 import org.elasticsearch.action.admin.indices.validate.query.ValidateQueryResponse;
 import org.elasticsearch.action.support.broadcast.BroadcastOperationThreading;
@@ -83,6 +84,11 @@ public class RestValidateQueryAction extends BaseRestHandler {
                 }
             }
             validateQueryRequest.types(splitTypes(request.param("type")));
+            if (request.paramAsBoolean("explain", false)) {
+                validateQueryRequest.explain(true);
+            } else {
+                validateQueryRequest.explain(false);
+            }
         } catch (Exception e) {
             try {
                 XContentBuilder builder = RestXContentBuilder.restContentBuilder(request);
@@ -103,6 +109,24 @@ public class RestValidateQueryAction extends BaseRestHandler {
 
                     buildBroadcastShardsHeader(builder, response);
 
+                    if(response.queryExplanations() != null && !response.queryExplanations().isEmpty()) {
+                        builder.startArray("explanations");
+                        for (QueryExplanation explanation : response.queryExplanations()) {
+                            builder.startObject();
+                            if (explanation.index() != null) {
+                                builder.field("index", explanation.index(), XContentBuilder.FieldCaseConversion.NONE);
+                            }
+                            builder.field("valid", explanation.valid());
+                            if (explanation.error() != null) {
+                                builder.field("error", explanation.error());
+                            }
+                            if (explanation.explanation() != null) {
+                                builder.field("explanation", explanation.explanation());
+                            }
+                            builder.endObject();
+                        }
+                        builder.endArray();
+                    }
                     builder.endObject();
                     channel.sendResponse(new XContentRestResponse(request, OK, builder));
                 } catch (Exception e) {

src/test/java/org/elasticsearch/test/integration/validate/SimpleValidateQueryTests.java

@@ -19,11 +19,17 @@
 
 package org.elasticsearch.test.integration.validate;
 
+import org.elasticsearch.action.admin.indices.validate.query.ValidateQueryResponse;
 import org.elasticsearch.client.Client;
 import org.elasticsearch.common.settings.ImmutableSettings;
+import org.elasticsearch.common.unit.DistanceUnit;
 import org.elasticsearch.common.xcontent.XContentFactory;
+import org.elasticsearch.index.query.FilterBuilders;
+import org.elasticsearch.index.query.QueryBuilder;
 import org.elasticsearch.index.query.QueryBuilders;
+import org.elasticsearch.index.search.geo.GeoDistance;
 import org.elasticsearch.test.integration.AbstractNodesTests;
+import org.hamcrest.Matcher;
 import org.testng.annotations.AfterClass;
 import org.testng.annotations.BeforeClass;
 import org.testng.annotations.Test;
@@ -81,4 +87,107 @@ public class SimpleValidateQueryTests extends AbstractNodesTests {
 
             assertThat(client.admin().indices().prepareValidateQuery("test").setQuery(QueryBuilders.queryString("foo:1 AND")).execute().actionGet().valid(), equalTo(false));
         }
+
+    @Test
+    public void explainValidateQuery() throws Exception {
+        client.admin().indices().prepareDelete().execute().actionGet();
+
+        client.admin().indices().prepareCreate("test").setSettings(ImmutableSettings.settingsBuilder().put("index.number_of_shards", 1)).execute().actionGet();
+        client.admin().cluster().prepareHealth().setWaitForGreenStatus().execute().actionGet();
+        client.admin().indices().preparePutMapping("test").setType("type1")
+                .setSource(XContentFactory.jsonBuilder().startObject().startObject("type1").startObject("properties")
+                        .startObject("foo").field("type", "string").endObject()
+                        .startObject("bar").field("type", "integer").endObject()
+                        .startObject("baz").field("type", "string").field("analyzer", "snowball").endObject()
+                        .startObject("pin").startObject("properties").startObject("location").field("type", "geo_point").endObject().endObject().endObject()
+                        .endObject().endObject().endObject())
+                .execute().actionGet();
+
+        client.admin().indices().prepareRefresh().execute().actionGet();
+
+
+        ValidateQueryResponse response;
+        response = client.admin().indices().prepareValidateQuery("test")
+                .setQuery("foo".getBytes())
+                .setExplain(true)
+                .execute().actionGet();
+        assertThat(response.valid(), equalTo(false));
+        assertThat(response.queryExplanations().size(), equalTo(1));
+        assertThat(response.queryExplanations().get(0).error(), containsString("Failed to parse"));
+        assertThat(response.queryExplanations().get(0).explanation(), nullValue());
+
+        assertExplanation(QueryBuilders.queryString("_id:1"), equalTo("ConstantScore(UidFilter([_uid:type1#1]))"));
+
+        assertExplanation(QueryBuilders.idsQuery("type1").addIds("1").addIds("2"),
+                equalTo("ConstantScore(UidFilter([_uid:type1#1, _uid:type1#2]))"));
+
+        assertExplanation(QueryBuilders.queryString("foo"), equalTo("_all:foo"));
+
+        assertExplanation(QueryBuilders.filteredQuery(
+                QueryBuilders.termQuery("foo", "1"),
+                FilterBuilders.orFilter(
+                        FilterBuilders.termFilter("bar", "2"),
+                        FilterBuilders.termFilter("baz", "3")
+                )
+        ), equalTo("filtered(foo:1)->cache(bar:[2 TO 2]) cache(baz:3)"));
+
+        assertExplanation(QueryBuilders.filteredQuery(
+                QueryBuilders.termQuery("foo", "1"),
+                FilterBuilders.orFilter(
+                        FilterBuilders.termFilter("bar", "2")
+                )
+        ), equalTo("filtered(foo:1)->cache(bar:[2 TO 2])"));
+
+        assertExplanation(QueryBuilders.filteredQuery(
+                QueryBuilders.matchAllQuery(),
+                FilterBuilders.geoPolygonFilter("pin.location")
+                        .addPoint(40, -70)
+                        .addPoint(30, -80)
+                        .addPoint(20, -90)
+        ), equalTo("ConstantScore(NotDeleted(GeoPolygonFilter(pin.location, [[40.0, -70.0], [30.0, -80.0], [20.0, -90.0]])))"));
+
+        assertExplanation(QueryBuilders.constantScoreQuery(FilterBuilders.geoBoundingBoxFilter("pin.location")
+                .topLeft(40, -80)
+                .bottomRight(20, -70)
+        ), equalTo("ConstantScore(NotDeleted(GeoBoundingBoxFilter(pin.location, [40.0, -80.0], [20.0, -70.0])))"));
+
+        assertExplanation(QueryBuilders.constantScoreQuery(FilterBuilders.geoDistanceFilter("pin.location")
+                .lat(10).lon(20).distance(15, DistanceUnit.MILES).geoDistance(GeoDistance.PLANE)
+        ), equalTo("ConstantScore(NotDeleted(GeoDistanceFilter(pin.location, PLANE, 15.0, 10.0, 20.0)))"));
+
+        assertExplanation(QueryBuilders.constantScoreQuery(FilterBuilders.geoDistanceFilter("pin.location")
+                .lat(10).lon(20).distance(15, DistanceUnit.MILES).geoDistance(GeoDistance.PLANE)
+        ), equalTo("ConstantScore(NotDeleted(GeoDistanceFilter(pin.location, PLANE, 15.0, 10.0, 20.0)))"));
+
+        assertExplanation(QueryBuilders.constantScoreQuery(FilterBuilders.geoDistanceRangeFilter("pin.location")
+                .lat(10).lon(20).from("15miles").to("25miles").geoDistance(GeoDistance.PLANE)
+        ), equalTo("ConstantScore(NotDeleted(GeoDistanceRangeFilter(pin.location, PLANE, [15.0 - 25.0], 10.0, 20.0)))"));
+
+        assertExplanation(QueryBuilders.filteredQuery(
+                QueryBuilders.termQuery("foo", "1"),
+                FilterBuilders.andFilter(
+                        FilterBuilders.termFilter("bar", "2"),
+                        FilterBuilders.termFilter("baz", "3")
+                )
+        ), equalTo("filtered(foo:1)->+cache(bar:[2 TO 2]) +cache(baz:3)"));
+
+        assertExplanation(QueryBuilders.constantScoreQuery(FilterBuilders.termsFilter("foo", "1", "2", "3")),
+                equalTo("ConstantScore(NotDeleted(cache(foo:1 foo:2 foo:3)))"));
+
+        assertExplanation(QueryBuilders.constantScoreQuery(FilterBuilders.notFilter(FilterBuilders.termFilter("foo", "bar"))),
+                equalTo("ConstantScore(NotDeleted(NotFilter(cache(foo:bar))))"));
+
+    }
+
+    private void assertExplanation(QueryBuilder queryBuilder, Matcher<String> matcher) {
+        ValidateQueryResponse response = client.admin().indices().prepareValidateQuery("test")
+                .setQuery(queryBuilder)
+                .setExplain(true)
+                .execute().actionGet();
+        assertThat(response.queryExplanations().size(), equalTo(1));
+        assertThat(response.queryExplanations().get(0).error(), nullValue());
+        assertThat(response.queryExplanations().get(0).explanation(), matcher);
+        assertThat(response.valid(), equalTo(true));
+    }
+
 }