Posts (page 91)
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5 min readTo get the last indexed record in Solr, you can use the 'q' parameter in the Solr query to sort the results by the unique key field in descending order and limit the results to just one. By using the 'fl' or 'fields' parameter, you can specify which fields you want to retrieve for the last indexed record.
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8 min readIn Apache Solr, an index is a data structure that organizes and stores information about the documents being indexed. It acts as a catalog that contains references to the documents and their corresponding field values. The index allows for efficient searching and retrieval of information by creating an optimized data structure that can be quickly searched and queried.
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5 min readTo sort by date in Solr, you can use the "sort" parameter in your Solr query and specify the field containing the date you want to sort by. You can use the field name followed by the direction in which you want to sort (ascending or descending). For example, if you have a field named "created_date" and you want to sort by it in descending order, you would include "sort=created_date desc" in your Solr query.
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5 min readTo import a MySQL database to Solr, you can use the Data Import Handler (DIH) feature in Solr. This feature allows you to pull data from various sources, including a MySQL database, and index it in Solr.To get started, you will need to configure the data-config.xml file in your Solr instance. This file defines the data source from which you want to import data, the SQL query to fetch the data, and mapping between the MySQL table columns and Solr fields.
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4 min readIn Solr, document popularity refers to the frequency with which a document appears in search results based on a particular query. This metric is usually calculated using factors such as the number of times a document has been clicked on, shared, bookmarked, or otherwise interacted with by users. Documents that are deemed more popular are typically given higher relevance scores and displayed more prominently in search results.
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6 min readTo index nested JSON objects in Solr, you can use Solr's JSON update format which allows you to index hierarchical data structures. You can provide a JSON document with nested objects and arrays, and Solr will automatically index it as fields with hierarchical names.
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8 min readTo index a text file in Solr line by line, you can use the Apache Solr DataImportHandler to read the text file and send each line as a separate document to be indexed. You will need to configure a data import handler in your Solr configuration file, specifying the location of the text file and the format in which the content should be parsed. You can then use the DataImportHandler command to trigger the indexing process and have Solr read and index each line of the text file sequentially.
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5 min readTo avoid duplicate results in grouped Solr search, you can use the collapse feature which allows you to group results based on a certain field and display only the most relevant result for each group. This feature works by collapsing documents that have the same value in the specified field, ensuring that each group is represented by a single document. By utilizing this feature in your Solr search, you can effectively prevent duplicate results from appearing in your grouped search queries.
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5 min readIn Solr, regular expressions (regex) can be used for querying by using the "RegExp" query parser. This allows you to search for patterns within text fields, giving you more flexibility in your search queries. When using regex in Solr, you can specify the field you want to search in and the regular expression pattern you want to match. This can be done by adding the "RegExp" query parser to your query string and specifying the field and pattern using the appropriate syntax.
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3 min readTo edit the .htaccess file, you will need to access your website's server using an FTP client or your web hosting control panel. Locate the .htaccess file in the root directory of your website. Download the file to your computer and open it using a text editor. Make the necessary changes to the file, such as adding redirects, password protection, or custom error pages. Save the file and upload it back to the server. Make sure to test the changes to ensure they are working correctly.
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6 min readTo make a word concordance with Solr, you will first need to set up Solr on your system and index the documents you want to analyze.Once you have indexed your documents, you can use Solr's built-in capabilities to create a concordance. One way to do this is by running a query that retrieves the text of the documents you are interested in and then using a tool like Solr's Highlighting component to extract the relevant terms.
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4 min readTo unset a cookie using .htaccess, you can use the Set-Cookie header with an expiration date in the past. This will effectively delete the cookie from the user's browser. Here is an example of how you can unset a cookie named "cookie_name" using .htaccess:Header set Set-Cookie "cookie_name=; Expires=Thu, 01 Jan 1970 00:00:00 GMT"This code sets the "cookie_name" cookie with an expiration date in the past, which tells the browser to remove the cookie.