Thanks again, whereas I think I have found now what I wanted (without needing
the Highlighter):
IndexReader reader = DirectoryReader.open(„index_directory");
log.info("Get terms of document ...");
TokenStream stream = TokenSources.getTokenStream(„field_name", null, text,
analyzer, -1);
stream.reset();
while (stream.incrementToken()) {
log.info("Term: " + stream.getAttribute(CharTermAttribute.class));
}
stream.close();
reader.close()
Thanks
Michael
> Am 12.11.2023 um 22:00 schrieb Mikhail Khludnev <m...@apache.org>:
>
> it's something over there
> https://github.com/apache/lucene/blob/4e2ce76b3e131ba92b7327a52460e6c4d92c5e33/lucene/highlighter/src/java/org/apache/lucene/search/highlight/Highlighter.java#L159
>
>
> On Sun, Nov 12, 2023 at 11:42 PM Michael Wechner <michael.wech...@wyona.com>
> wrote:
>
>> Hi Mikhail
>>
>> Thank you very much for your feedback!
>>
>> I have found various examples for the first option when running a query,
>> e.g.
>>
>> https://howtodoinjava.com/lucene/lucene-search-highlight-example/
>>
>> but don't understand how to implement the second option, resp. how to
>> get the extracted terms of a document field independent of a query?
>>
>> Can you maybe give a code example?
>>
>> Thanks
>>
>> Michael
>>
>>
>>
>> Am 12.11.23 um 18:46 schrieb Mikhail Khludnev:
>>> Hello,
>>> This is what highlighters do. There are two options:
>>> - index termVectors, obtain them in search time.
>>> - obtain the stored field value, analyse it again, get all terms.
>>> Good Luck
>>>
>>> On Sun, Nov 12, 2023 at 7:47 PM Michael Wechner <
>> michael.wech...@wyona.com>
>>> wrote:
>>>
>>>> HI
>>>>
>>>> IIUC I can get all terms of a particular field of an index with
>>>>
>>>> IndexReader reader = DirectoryReader.open(„index_directory");
>>>> List<LeafReaderContext> list = reader.leaves();
>>>> for (LeafReaderContext lrc : list) {
>>>> Terms terms = lrc.reader().terms(„field_name");
>>>> if (terms != null) {
>>>> TermsEnum termsEnum = terms.iterator();
>>>> BytesRef term = null;
>>>> while ((term = termsEnum.next()) != null) {
>>>> System.out.println("Term: " + term.utf8ToString());
>>>> }
>>>> }
>>>> }
>>>> reader.close();
>>>> But how I can get all terms of a particular field of a particular
>> document?
>>>> Thanks
>>>> Michael
>>>>
>>>> P.S.: Btw, does it make sense to update the Lucene FAQ
>>>>
>>>>
>> https://cwiki.apache.org/confluence/display/lucene/lucenefaq#LuceneFAQ-HowdoIretrieveallthevaluesofaparticularfieldthatexistswithinanindex,acrossalldocuments
>>>> ?
>>>> with the code above?
>>>> I can do this, but want to make sure, that I don’t update it in a wrong
>>>> way.
>>>>
>>>>
>>>>
>>>>
>>
>>
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>>
>>
>
> --
> Sincerely yours
> Mikhail Khludnev
