Throws a parse error when query gets executed

SpanOrPb.java

import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.action.search.SearchRequestBuilder;
import org.elasticsearch.index.query.xcontent.SpanOrQueryBuilder;
import org.elasticsearch.index.query.xcontent.SpanTermQueryBuilder;
import org.elasticsearch.node.Node;
import org.elasticsearch.node.NodeBuilder;

import static org.elasticsearch.node.NodeBuilder.nodeBuilder;


public class SpanOrPb {
    public static void main(String[] args) throws InterruptedException {
        final NodeBuilder nodeBuilder = nodeBuilder();
        nodeBuilder.settings().put("path.data", "/home/cedric/NOTYET-SVN/LEA-ELASTICSEARCH/leastic/data");
        Node node = nodeBuilder.local(true).node();
        Client client = node.client();
        // Wait 2 seconds to get nodes ready
        Thread.sleep(2000);

        // Now run a query
        SpanOrQueryBuilder soqb = new SpanOrQueryBuilder();
        soqb.clause(
                new SpanTermQueryBuilder("title", "java").boost(1.0f)
        );
        soqb.clause(
                new SpanTermQueryBuilder("title", "javas").boost(1.0f)
        );
        final SearchRequestBuilder builder = client.prepareSearch().setQuery(soqb);
        builder.setIndices("leastic");
        builder.setTypes("resume");
        builder.addField("vid");
        builder.addField("title");
        final SearchResponse response = builder.execute().actionGet();
        // Throws : 
        // Exception in thread "main" org.elasticsearch.action.search.SearchPhaseExecutionException: Failed to execute phase [query], total failure; shardFailures {[1][leastic][3]: SearchParseException[[leastic][3]: from[-1],size[-1]: Parse Failure [Failed to parse source [_na_]]]; nested: QueryParsingException[[leastic] spanOr must include [clauses]]; }{[1][leastic][0]: SearchParseException[[leastic][0]: from[-1],size[-1]: Parse Failure [Failed to parse source [_na_]]]; nested: QueryParsingException[[leastic] spanOr must include [clauses]]; }{[1][leastic][1]: SearchParseException[[leastic][1]: from[-1],size[-1]: Parse Failure [Failed to parse source [_na_]]]; nested: QueryParsingException[[leastic] spanOr must include [clauses]]; }{[1][leastic][2]: SearchParseException[[leastic][2]: from[-1],size[-1]: Parse Failure [Failed to parse source [_na_]]]; nested: QueryParsingException[[leastic] spanOr must include [clauses]]; }
        //	at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.onFirstPhaseResult(TransportSearchTypeAction.java:248)
        //	at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.access$400(TransportSearchTypeAction.java:75)
        //	at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$3.onFailure(TransportSearchTypeAction.java:198)
        //	at org.elasticsearch.search.action.SearchServiceTransportAction.sendExecuteQuery(SearchServiceTransportAction.java:137)
        //	at org.elasticsearch.action.search.type.TransportSearchQueryThenFetchAction$AsyncAction.sendExecuteFirstPhase(TransportSearchQueryThenFetchAction.java:76)
        //	at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.performFirstPhase(TransportSearchTypeAction.java:192)
        //	at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction.access$000(TransportSearchTypeAction.java:75)
        //	at org.elasticsearch.action.search.type.TransportSearchTypeAction$BaseAsyncAction$2.run(TransportSearchTypeAction.java:169)
        //	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        //	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        //	at java.lang.Thread.run(Thread.java:662)

    }
}