What is DisMax and eDisMax in solr?

The Extended DisMax (eDisMax) query parser is an improved version of the DisMax query parser. In addition to supporting all the DisMax query parser parameters, Extended Dismax: supports the full Lucene query parser syntax. supports queries such as AND, OR, NOT, -, and +.

What is DisMax in solr?

The DisMax query parser is designed to process simple phrases (without complex syntax) entered by users and to search for individual terms across several fields using different weighting (boosts) based on the significance of each field.

What is QF in solr?

The df stands for default field , while the qf stands for query fields . The field defined by the df parameter is used when no fields are mentioned in the query. For example if you are running a query like q=solr and you have df=title the query itself will actually be title:solr .

What is boost query in solr?

bf (Boost Functions) Parameter The bf parameter specifies functions (with optional boosts) that will be used to construct FunctionQueries which will be added to the user’s main query as optional clauses that will influence the score. Any function supported natively by Solr can be used, along with a boost value.

How do you query SOLR?

The main query for a solr search is specified via the q parameter. Standard Solr query syntax is the default (registered as the “lucene” query parser). If this is new to you, please check out the Solr Tutorial. Adding debug=query to your request will allow you to see how Solr is parsing your query.

What is fuzzy search in Solr?

The Solr fuzzy search syntax uses the Damerau-Levenshtein Distance algorithm to determine similarity of spelling based on distance. The default distance is 2. Change the distance by specifying 0-2 after the tilde (Kenya~1).

What is faceting in Solr?

Faceting is the arrangement of search results into categories based on indexed terms. Searchers are presented with the indexed terms, along with numerical counts of how many matching documents were found were each term.

Does Solr support fuzzy search?

Solr supports fuzzy search based on Damerau-Levenshtein Distance or Edit Distance algorithm.

What does fuzzy search do?

A fuzzy search is a process that locates Web pages that are likely to be relevant to a search argument even when the argument does not exactly correspond to the desired information.

What are different types of indexing in Solr?

Indexing in Apache Solr In Apache Solr, we can index (add, delete, modify) various document formats such as xml, csv, pdf, etc. We can add data to Solr index in several ways. Using the Solr Web Interface. Using any of the client APIs like Java, Python, etc.

What is a data facet?

Facets consists of two visualizations that allow users to see a holistic picture of their data at different granularities. Get a sense of the shape of each feature of the data using Facets Overview, or explore a set of individual observations using Facets Dive.

What faceting means?

In geometry, faceting (also spelled facetting) is the process of removing parts of a polygon, polyhedron or polytope, without creating any new vertices. New edges of a faceted polyhedron may be created along face diagonals or internal space diagonals.

What is inverted index in Solr?

The standard way that Solr builds the index is with an inverted index. This style builds a list of terms found in all the documents in the index and next to each term is a list of documents that the term appears in (as well as how many times the term appears in that document).

What is dynamic field in Solr?

Dynamic fields allow Solr to index fields that you did not explicitly define in your schema. This is useful if you discover you have forgotten to define one or more fields. Dynamic fields can make your application less brittle by providing some flexibility in the documents you can add to Solr.

What is copyField in Solr?

copyField uses the matching glob from the source field for the dest field name into which the source content is copied. Copying is done at the stream source level and no copy feeds into another copy. This means that copy fields cannot be chained i.e. you cannot copy from here to there and then from there to elsewhere .

What is dismax in Solr?

The term “dismax” gets tossed around on the Solr lists frequently, which can be fairly confusing to new users. It originated as a shorthand name for the DisMaxRequestHandler (which I named after the DisjunctionMaxQueryParser, which I named after the DisjunctionMaxQuery class that it uses heavily).

What is the difference between dismax and edismax?

In general EDisMax is an extended version of the DisMax. You can find good description and differences of both parser in the following links.

What is a dismax query?

DisMax stands for Maximum Disjunction. Here’s a definition of a Maximum Disjunction or “DisMax” query: A query that generates the union of documents produced by its subqueries, and that scores each document with the maximum score for that document as produced by any subquery, plus a tie breaking increment for any additional matching subqueries.

Can edismax run queries against all query fields?

Dismax and Edismax can run queries against all query fields, and also run a query in the form of a phrase against the phrase fields. (This will work only for boosting documents, not actually for matching.)