QueryFilterParser.java example

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 * 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,
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package org.elasticsearch.index.query;

import org.apache.lucene.search.ConstantScoreQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.logging.DeprecationLogger;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.common.logging.Loggers;

import java.io.IOException;

@Deprecated
public class QueryFilterParser implements QueryParser {

    public static final String NAME = "query";
    private final DeprecationLogger deprecationLogger;

    @Inject
    public QueryFilterParser() {
        ESLogger logger = Loggers.getLogger(getClass());
        deprecationLogger = new DeprecationLogger(logger);
    }

    @Override
    public String[] names() {
        return new String[]{NAME};
    }

    @Override
    public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
        deprecationLogger.deprecated("The [query] filter is deprecated, you can now use queries as filters directly.");
        return new ConstantScoreQuery(parseContext.parseInnerQuery());
    }
}