lucene | Apache Lucene open-source search software | Search Engine library

So, i have a solr version 7.7.2 running in two different nodes. i wanted to copy the the index data from one to another. all the other config files remain the same (including core and solrconfig.xml). So I copy pasted the data directory and the configsets from one node to another.

Now open starting the server, I am getting this exception -

we got a unique scenario while using Azure search for one of the project. So, our clients wanted to respect user's privacy, hence we have a feature where a user can restrict search for any PII data. So, if user has opted for Privacy, we can only search for him/her with UserID else we can search using Name, Phone, City, UserID etc.

JSON where Privacy is opted:

I've been trying to create interact with my JanusGraph setup in docker. But after many tries I still don't succeed.

How I connect to JG.

I have two different entities in a table, pdfField, and formField. I'd want to build a search that returns the formField if we enter in pdfField.

I would like to use Lucene to run a nearest neighbour search. I'm using Lucene 9.0.0 on JVM 11. I did not find much documentation and mainly tried to piece things together using the existing tests.

I wrote a small test which prepares a HnswGraph but so far the search does not yield the expected result. I setup a set of random vectors and add a final vector (0.99f,0.01f) which is very close to my search target. The search unfortunately never returns the expected value. I'm not sure where my error is. I assume it may be related with the insert and document id order.

Maybe someone who is more familar with lucene might be able to provide some feedback. Is my approach correct? I'm using Documents only for persistence.

I am using FSDirectory to query a previously built (and also static) Lucene index.

I would like to use the query from a WebApi, that's stateless and at the moment instantiate a new FSDirectory for each call received.

I am not sure if this is the best approach of if it's better to pool the FSDirectory. I expect that this "issue" is already covered by the framework, but I am new to this tool and don't know how to proceed.

Given the following Elasticsearch document structure

How one would write a Lucene 8.11 ByteBuffersDirectory to disk?
something similar to Lucene 2.9.4 Directory.copy(directory, FSDirectory.open(indexPath), true)

I am using opengrok at work, trying to match certain anchors in the codebase using regular expressions

From opengrok documentation:

Escaping special characters: Opengrok supports escaping special characters that are part of the query syntax. Current special characters are: + - && || ! ( ) { } [ ] ^ " ~ * ? : \ /

Since anchors are not special characters my query is as follow:

lucene fails to parse my query for some reason:

Now when I escape both anchors /\*/, it does not fail but I get 0 results. There are thousands of * text in our codebase. What am I doing wrong?