I'm trying to write a little Unit Test to check that we setting up our objects correctly. To do this I'm setting up a FacetBuilder and convert it to Json that from where I can assert its correctness.
However, when I try to convert the FacetBuilder to Json I get an Exception:
TermsFacetBuilder facetBuilder = FacetBuilders.termsFacet("name").field("field");
String jsonString = facetBuilder.toXContent(XContentFactory.safeJsonBuilder(), EMPTY_PARAMS).string();
org.elasticsearch.common.jackson.JsonGenerationException: Can not write a field name, expecting a value
at org.elasticsearch.common.jackson.impl.JsonGeneratorBase._reportError(JsonGeneratorBase.java:480)
at org.elasticsearch.common.jackson.impl.Utf8Generator.writeFieldName(Utf8Generator.java:270)
at org.elasticsearch.common.xcontent.json.JsonXContentGenerator.writeFieldName(JsonXContentGenerator.java:70)
at org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:253)
at org.elasticsearch.common.xcontent.XContentBuilder.startObject(XContentBuilder.java:139)
at org.elasticsearch.search.facet.terms.TermsFacetBuilder.toXContent(TermsFacetBuilder.java:211)
I tried both versions 0.17.4 and 0.17.7 with pretty consistent results (StackTrace is for 0.17.7)
I fired up a debugger and stepped through the code and there is nothing that is null or otherwise broken.