Solr: Retrieve field names from a solr index?

Question

How can I query a Solr instance for all (or prefixed) field names?

I want to use dynamic fields where I do not know how many may exist e.g: category_0_s,

Answer 1

If you need to do this from your Java application you can use Solrj and LukeRequestRequestHandler.

Your code would look like this.

LukeRequest lukeRequest = new LukeRequest();
lukeRequest.setNumTerms(0);

LukeResponse lukeResponse = lukeRequest.process(server);

Map fieldInfoMap = lukeResponse.getFieldInfo();

for (Entry entry : fieldInfoMap.entrySet()) {

    String fieldName = entry.getKey();
    FieldInfo fieldInfo = entry.getValue();

    // process fieldInfo    
}