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

 by   apache Java Version: releases/lucene/9.6.0 License: Apache-2.0

kandi X-RAY | lucene Summary

kandi X-RAY | lucene Summary

lucene is a Java library typically used in Database, Search Engine applications. lucene has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has medium support. You can download it from GitHub.

Apache Lucene is a high-performance, full-featured text search engine library written in Java.
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            kandi-support Support

              lucene has a medium active ecosystem.
              It has 1763 star(s) with 747 fork(s). There are 78 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 1970 open issues and 8882 have been closed. On average issues are closed in 113 days. There are 120 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of lucene is releases/lucene/9.6.0

            kandi-Quality Quality

              lucene has no bugs reported.

            kandi-Security Security

              lucene has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              lucene is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              lucene releases are available to install and integrate.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.

            Top functions reviewed by kandi - BETA

            kandi has reviewed lucene and discovered the below as its top functions. This is intended to give you an instant insight into lucene implemented functionality, and help decide if they suit your requirements.
            • Called at the end of the doclet
            • Outputs an error message
            • Checks the given element
            • Makes sure that the given XML comment is valid
            • Returns a stream containing all the super types of the given type
            • Returns true if the given element has overrides any inherited javadocs
            • Checks that the parameters in the given element is annotations
            • Utility method to extract Reuters Reports
            • Extracts the file from SGM file
            • Extracts SIM files from the reaper
            • Download the wrapper downloader
            • Copy the wrapper version file to the provided destination directory
            • Computes the checksum for a file
            • Generate the checksum files
            • Returns a list of all possible checksum files for this algorithm
            • Returns the supported options for this doclet
            Get all kandi verified functions for this library.

            lucene Key Features

            No Key Features are available at this moment for lucene.

            lucene Examples and Code Snippets

            No Code Snippets are available at this moment for lucene.

            Community Discussions

            QUESTION

            SonarQube Docker Installation CorruptIndexException: checksum failed
            Asked 2022-Mar-31 at 08:20

            I'm trying to create docker container with SonarQube inside it, but I get this error while composing for the first time:

            ...

            ANSWER

            Answered 2022-Mar-31 at 08:20

            Solved it by using image: sonarqube:9.2.4-developer

            Source https://stackoverflow.com/questions/71679132

            QUESTION

            Solr corrupt index exception
            Asked 2022-Mar-22 at 12:25

            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 -

            ...

            ANSWER

            Answered 2022-Mar-22 at 12:25

            As per @MatsLindh 's suggestion, I took backup of the existing core and then copied the data. The nodes are working fine now.

            Thanks @MatsLindh for the help

            Source https://stackoverflow.com/questions/71569743

            QUESTION

            Optimise conditional queries in Azure cognitive search
            Asked 2022-Mar-09 at 09:19

            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:

            ...

            ANSWER

            Answered 2022-Mar-04 at 16:32

            From the client side you could dynamically add the ¨SearchFields¨ parameter as part of the query, that way if the user got the Privacy flag set to true, only UserId is set as part of the available Search fields. https://docs.microsoft.com/en-us/dotnet/api/microsoft.azure.search.models.searchparameters.searchfields?view=azure-dotnet

            Source https://stackoverflow.com/questions/71338986

            QUESTION

            JanusGraph Java unable to add vertex/edge
            Asked 2022-Mar-06 at 13:51

            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.

            ...

            ANSWER

            Answered 2022-Mar-06 at 13:51

            The GraphTraversal object is only a "plan" to be carried out. To have it take effect, you need a closing method like next, toList, etc., like you did for the count.

            The confusion probably arose from the fact that the gremlin console automatically keeps nexting the traversal a configured number of times.

            Source https://stackoverflow.com/questions/71369727

            QUESTION

            Hibernate Search returns a string type
            Asked 2022-Jan-28 at 20:50

            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.

            ...

            ANSWER

            Answered 2022-Jan-28 at 20:50

            I think it would be easier for you to switch to Spring Data JPA. Using that it would be easier for you to achieve the desired goal:

            Source https://stackoverflow.com/questions/70892205

            QUESTION

            Howto run Nearest Neighbour Search with Lucene HnswGraph
            Asked 2022-Jan-06 at 15:27

            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.

            ...

            ANSWER

            Answered 2022-Jan-02 at 04:41

            I managed to get this working.

            Instead of using the HnswGraph API directly I now use LeafReader#searchNearestVectors. While debugging I noticed that the Lucene90HnswVectorsWriter for example invokes extra steps using the HnswGraph API. I assume this is done to create a correlation between inserted vectors and document Ids. The nodeIds I retrieved using a HnswGraph#search never matched up with the matched up with the vector Ids. I don't know whether extra steps are needed to setup the graph or whether the correlation needs to be created afterwards somehow.

            The good news is that the LeafReader#searchNearestVectors method works. I have updated the example which now also makes use of the Lucene documents.

            Source https://stackoverflow.com/questions/70477808

            QUESTION

            Read Lucene FSDirectory from WebApi
            Asked 2022-Jan-03 at 15:04

            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.

            ...

            ANSWER

            Answered 2022-Jan-03 at 15:04

            There can be a lot of overhead to opening the index and getting it warmed as it will need to build caches, for example FieldCache. Further, both the IndexReader class and the IndexWriter classes are thread safe.

            So the typical best practice for a WebAPI, or any use for that mater, would be to use a single IndexReader or a single IndexWriter to service all threads and this can be done by your code easily since both of those classes are thread safe.

            So typically when the system starts up it will instantiate one of those, lets say a IndexWriter and it will place that where all WebAPI calls can get access to it. They may use the IndexWriter for writing or use a reader obtained from IndexWriter.GetReader() for reading.

            Source https://stackoverflow.com/questions/70494460

            QUESTION

            Grafana Elasticsearch - Query condition that references field value
            Asked 2021-Dec-14 at 13:41

            Given the following Elasticsearch document structure

            ...

            ANSWER

            Answered 2021-Dec-14 at 13:41

            I was able to get it working by creating an alias in Elasticsearch, like below:

            Source https://stackoverflow.com/questions/70203805

            QUESTION

            How to write/serialize lucene's ByteBuffersDirectory to disk?
            Asked 2021-Dec-04 at 01:31

            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)

            ...

            ANSWER

            Answered 2021-Dec-04 at 01:21

            You can use the copyFrom method to do this.

            For example:

            You are using a ByteBuffersDirectory:

            Source https://stackoverflow.com/questions/70221116

            QUESTION

            Opengrok cannot escape anchors on full search
            Asked 2021-Nov-18 at 17:12

            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?

            ...

            ANSWER

            Answered 2021-Nov-18 at 17:12

            The "<" and ">" characters are not indexed by Lucene (they're not in the index), so they're not searchable.

            See more related info here.

            Source https://stackoverflow.com/questions/70021780

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install lucene

            You can download it from GitHub.
            You can use lucene like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the lucene component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

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            https://github.com/apache/lucene.git

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            gh repo clone apache/lucene

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            git@github.com:apache/lucene.git

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