Exists filter throws NullPointerException on empty index

[SergVro]

In 1.7.1
Using Filtered query with Exists filter causes SearchParseException on an empty index.

Steps to reproduce:

# make sure there is no such index
curl -XDELETE localhost:9200/test_index

# create a new index
curl -XPUT localhost:9200/test_index

# issue a query with Exists Filter
curl -XGET localhost:9200/test_index/_search -d '
{
    "query": {
        "filtered": {
           "query": {
           "match_all": {}
           },
           "filter": {
               "exists": {
                  "field": "user"
               }
           }
        }
    }
}
'

Stack trace:

org.elasticsearch.search.SearchParseException: [test_index][3]: from[-1],size[-1]: Parse Failure [Failed to parse source [{
    "query": {
        "filtered": {
           "query": {
           "match_all": {}
           },
           "filter": {
               "exists": {
                  "field": "user"
               }
           }
        }
    }
}
]]
    at org.elasticsearch.search.SearchService.parseSource(SearchService.java:747)
    at org.elasticsearch.search.SearchService.createContext(SearchService.java:572)
    at org.elasticsearch.search.SearchService.createAndPutContext(SearchService.java:544)
    at org.elasticsearch.search.SearchService.executeQueryPhase(SearchService.java:306)
    at org.elasticsearch.search.action.SearchServiceTransportAction$5.call(SearchServiceTransportAction.java:231)
    at org.elasticsearch.search.action.SearchServiceTransportAction$5.call(SearchServiceTransportAction.java:228)
    at org.elasticsearch.search.action.SearchServiceTransportAction$23.run(SearchServiceTransportAction.java:559)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
    at org.elasticsearch.index.query.ExistsFilterParser.newFilter(ExistsFilterParser.java:87)
    at org.elasticsearch.index.query.ExistsFilterParser.parse(ExistsFilterParser.java:82)
    at org.elasticsearch.index.query.QueryParseContext.executeFilterParser(QueryParseContext.java:371)
    at org.elasticsearch.index.query.QueryParseContext.parseInnerFilter(QueryParseContext.java:352)
    at org.elasticsearch.index.query.FilteredQueryParser.parse(FilteredQueryParser.java:74)
    at org.elasticsearch.index.query.QueryParseContext.parseInnerQuery(QueryParseContext.java:305)
    at org.elasticsearch.index.query.IndexQueryParserService.innerParse(IndexQueryParserService.java:382)
    at org.elasticsearch.index.query.IndexQueryParserService.parse(IndexQueryParserService.java:281)
    at org.elasticsearch.index.query.IndexQueryParserService.parse(IndexQueryParserService.java:276)
    at org.elasticsearch.search.query.QueryParseElement.parse(QueryParseElement.java:33)
    at org.elasticsearch.search.SearchService.parseSource(SearchService.java:731)
    ... 9 more

[colings86]

This has been fixed in 2.0

[SergVro]

We can't use 2.0, that's why I need this fixed in 1.6 or 1.7