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The library is compatible with all Elasticsearch versions since x but .. http:// osakeya.info O'Reilly Media, Inc. Hadoop: The Definitive Guide, the image of an African. Elasticsearch: The Definitive Guide: A distributed real-time search and analytics. [email protected] Elasticsearch, Logstash & Kibana "title": " Elasticsearch - The definitive guide",. "authors": "Clinton Gormley".
The answer is yes: Try this:.
Additionally to searching in one index, we can search in multiple indices at the same time by providing a comma-separated list of indices names, and the same can be done for types. There are more options: As an exercise for the reader, add documents to a second different index and do searches in both indices simultaneously.
To close this section, we will delete a document, and then the entire index.
After deleting the document, try to retrieve or find it in searches. So far, we played with some fictional data. In this section we will be exploring Shakespeare plays. The first step is to download the file shakespeare. Elasticsearch offers a Bulk API that allows you to perform add, delete, update and create operations in bulk, i.
This file contains data ready to be ingested using this API, prepared to be indexed in an index called Shakespeare containing documents of type act, scene and line. We will not dig deeper into the Bulk API: Since the body of this request is fairly big more than , lines , it is recommended to do this via a tool that allows to load the body of a request from a file - for instance, using curl:.
Once the data is loaded, we can start doing some searches. In the previous section we did the searches passing the query in the URL. The format for searches is pretty straight forward. A lot of different types of searches are available: The full reference can be found in the Query DSL documentation ; we will do just some examples here to get familiar with how we can use them. In the previous query we are searching for all of the scenes see the URL in which the play name contains Antony.
We can refine this search, and select also the scenes in which Demetrius is the speaker:. As a first exercise for the reader, modify the previous query so the search returns not only scenes in which the speaker is Demetrius, but also scenes in which the speaker is Antony - as a hint, check the boolean should clause.
As a second exercise for the reader, it is left to explore the different options that can be used in the Request body when searching - for instance, selecting from what position in the results we want to start and how many results we want to retrieve to do pagination.
So far, we did some queries using the Query DSL. What if, apart from retrieving the contents we are looking for, we can also do some analytics? This is where aggregations come into play. Aggregations allow us to get a deeper insight into the data: How many scenes are there on average per work?
What are the works with more scenes? In Elastic, we can create indices defining what the datatypes are for the different fields they can have: The datatypes that an index can have are defined via the mappings. In this case, we did not create any index prior to indexing documents, so Elastic decided what was the type of each field it created the mapping of the index.
However, this method is limited and does not give you access to most of the more powerful query features. Basic queries use the q query string parameter which supports the Lucene query parser syntax and hence filters on specific fields e.
There are a variety of other options e.
In the query language queries are written as a JSON structure and is then sent to the query endpoint details of the query langague below. There are two options for how a query is sent to the search endpoint: Either as the value of a source query parameter e.
Simple means e. These sub-components are either basic or compound. Conditions of use This documentation build process is provided to the public purely for the purpose of testing documentation changes before submitting pull requests to the appropriate Elasticsearch repository. The documents produced by this build process may be published only on http: They may not be published in any other form or on any other website without explicit permission.
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