I have implemented own Lucene Analyzer. How can I use it with ElasticSearch?
You will need to implement AnalysisBinderProcessor, which would make your analyzer available to elasticsearch and than wrap it into an elasticsearch plugin. The simplest way to do it is by starting with one of the many examples available on github.
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I want to take a look at the actual terms in an Elasticsearch index. In Solr, I can just open the admin and get a list of the most common terms. Is there an Elasticsearch equivalent of this?
I want to use aggregations over the search result of the knn_search api in elasticsearch (because I need facet search on the user interface), but I cannot pass the agg parameter as in the search api. Any suggestions?
Tldr;
As per the documentation of this endpoint GET /<index>/_knn_search.
You just can not give the parameter agg.
In 8.4
Although in the latest version of elasticsearch, you can use the knn search in the standard search queries.
I'm trying to figure out how elasticsearch analyzers work exactly and I'm using the _analyze api e.g. _analyze?text=http://www.google.com
Does elasticsearch provide the information of which analyzer was used?
Although the information provided is step by step of the analysis performed, some analyzers may produce the same output so instead of trying to force a different output in order to check which analyzer was used, I was wondering if this can be provided by the api.
I'm using ElasticSearch 1.7.5
It will not give you the analyzer being used because it's supposed to be specified either in the command itself with ?analyzer= or using the analyzer from the index or from the field that's being used in the command.
Also, there are rules related to which analyzer is being used and you should be able to determine from these which one is actually applied: https://www.elastic.co/guide/en/elasticsearch/guide/current/_controlling_analysis.html#_default_analyzers
When searching in Elastic search, by default, the globally defined analyzer is used. How can I find out what this analyzer is ? We are using a Elastic search saas provider and I thus want to find out what the setting is ?
As far as I am aware, Elasticsearch will use the Standard Analyzer as default if none other is specified upon index creation.
I want to build elastisearch queries using JAVA API. I want to know how to can use Lucene analyzers in elasticsearch java programs. I have checked QueryBuilders and tried to use analyzers directly as below.
QueryBuilder builder = QueryBuilders.matchQuery(searchString, fields).analyzer("porterstem");
But, it turned out to be wrong. If any one tried it, could you please give me some information?
You should define your analyzer in mapping.
So the analyzer will be used at index time and at query time.
ANALYZERS are used to analyze the documents that your are indexed. Analysis means it Ll split,the text in to tokens, normalize it, and also Lower case your indexed doc text. This analysis process Ll b more helpful while you search and searching will be faster..
You can mention analyzer while you query . But analyze the stored documents during query time. Ll b expensive. So analyze the document during indexing time. ES will analysis the doc during indexed and query time will b less and faster result.
So mention analyzers in mapping and searching efficiently..
For more information about analyzer refer
https://lucene.apache.org/core/4_0_0/core/org/apache/lucene/analysis/Analyzer.html