private AggregationBuilder<?> updateAggIfNested(AggregationBuilder<?> lastAgg, Field field) {
if (field.isNested()) {
lastAgg =
AggregationBuilders.nested(field.getName() + "Nested")
.path(field.getNestedPath())
.subAggregation(lastAgg);
}
return lastAgg;
}
private AggregationBuilder createNestedAggregation(Field field) {
AggregationBuilder nestedBuilder;
String nestedPath = field.getNestedPath();
if (field.isReverseNested()) {
if (nestedPath == null || !nestedPath.startsWith("~"))
return AggregationBuilders.reverseNested(getNestedAggName(field)).path(nestedPath);
nestedPath = nestedPath.substring(1);
}
nestedBuilder = AggregationBuilders.nested(getNestedAggName(field)).path(nestedPath);
return nestedBuilder;
}
private String getNestedAggName(Field field) {
String prefix;
if (field instanceof MethodField) {
String nestedPath = field.getNestedPath();
if (nestedPath != null) {
prefix = nestedPath;
} else {
prefix = field.getAlias();
}
} else {
prefix = field.getName();
}
return prefix + "@NESTED";
}
