RestForceMergeAction.java example

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elasticsearch-master
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 *    http://www.apache.org/licenses/LICENSE-2.0
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package org.elasticsearch.rest.action.admin.indices;

import org.elasticsearch.action.admin.indices.forcemerge.ForceMergeRequest;
import org.elasticsearch.action.admin.indices.forcemerge.ForceMergeResponse;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.client.node.NodeClient;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.rest.BaseRestHandler;
import org.elasticsearch.rest.BytesRestResponse;
import org.elasticsearch.rest.RestController;
import org.elasticsearch.rest.RestRequest;
import org.elasticsearch.rest.RestResponse;
import org.elasticsearch.rest.action.RestBuilderListener;

import java.io.IOException;

import static org.elasticsearch.rest.RestRequest.Method.POST;
import static org.elasticsearch.rest.RestStatus.OK;
import static org.elasticsearch.rest.action.RestActions.buildBroadcastShardsHeader;

public class RestForceMergeAction extends BaseRestHandler {
    public RestForceMergeAction(Settings settings, RestController controller) {
        super(settings);
        controller.registerHandler(POST, "/_forcemerge", this);
        controller.registerHandler(POST, "/{index}/_forcemerge", this);
    }

    @Override
    public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
        ForceMergeRequest mergeRequest = new ForceMergeRequest(Strings.splitStringByCommaToArray(request.param("index")));
        mergeRequest.indicesOptions(IndicesOptions.fromRequest(request, mergeRequest.indicesOptions()));
        mergeRequest.maxNumSegments(request.paramAsInt("max_num_segments", mergeRequest.maxNumSegments()));
        mergeRequest.onlyExpungeDeletes(request.paramAsBoolean("only_expunge_deletes", mergeRequest.onlyExpungeDeletes()));
        mergeRequest.flush(request.paramAsBoolean("flush", mergeRequest.flush()));
        return channel -> client.admin().indices().forceMerge(mergeRequest, new RestBuilderListener<ForceMergeResponse>(channel) {
            @Override
            public RestResponse buildResponse(ForceMergeResponse response, XContentBuilder builder) throws Exception {
                builder.startObject();
                buildBroadcastShardsHeader(builder, request, response);
                builder.endObject();
                return new BytesRestResponse(OK, builder);
            }
        });
    }
}