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Health · Elastic Search Definitive Guide

Webnumber_of_nodes and number_of_data_nodes are fairly self-descriptive.. active_primary_shards indicates the number of primary shards in your cluster. This is an …

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URL: https://feliperohdee.gitbooks.io/elastic-search-definitive-guide/500_Cluster_Admin/20_health.html

Cluster Health · Elastic Search Definitive Guide

WebCluster Health. Many statistics can be monitored in an Elasticsearch cluster, but the single most important one is cluster health, which reports a status of either green, yellow, or …

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Add an Index · Elastic Search Definitive Guide

WebA cluster health of yellow means that all primary shards are up and running (the cluster is capable of serving any request successfully) but not all replica shards are active. In fact, …

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Configuring · Elastic Search Definitive Guide

WebImagine, for instance, that users searching for the World Health Organization'' are instead getting results for organ health.''The reason for this confusion is that both organ'' and …

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Stopwords and Performance · Elastic Search Definitive Guide

WebThe biggest disadvantage of keeping stopwords is that of performance. When Elasticsearch performs a full-text search, it has to calculate the relevance _score on all matching …

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Geohash Cell Filter · Elastic Search Definitive Guide

WebRemember that a geohash is just a rectangle, and the point may fall anywhere within that rectangle. If the point happens to fall near the edge of a geohash cell, the filter may well …

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Boosting Filtered Subsets · Elastic Search Definitive Guide

WebThe first thing to note is that we have specified a filter instead of a query.In this example, we do not need full-text search. We just want to return all documents that have Barcelona in …

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Compound Filters · Elastic Search Definitive Guide

WebIn this secondary boolean query, we can ignore the filter clause: the queries are already running in non-scoring mode, so the extra filter clause is useless. Each section of the …

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Fetch Phase · Elastic Search Definitive Guide

WebThe coordinating node first decides which documents actually need to be fetched. For instance, if our query specified { "from": 90, "size": 10 }, the first 90 results would be …

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Logging · Elastic Search Definitive Guide

WebElasticsearch emits a number of logs, which are placed in ES_HOME/logs.The default logging level is INFO.It provides a moderate amount of information, but is designed to be …

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Queries vs Filters · Elastic Search Definitive Guide

WebHistorically, queries and filters were separate components in Elasticsearch. Starting in Elasticsearch 2.0, filters were technically eliminated, and all queries gained the ability to …

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Denormalization · Elastic Search Definitive Guide

WebDenormalization. Denormalizing Your Data. The way to get the best search performance out of Elasticsearch is to use it as it is intended, by denormalizing your data at index time. …

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Geohashes · Elastic Search Definitive Guide

WebGeohashes divide the world into a grid of 32 cells— 4 rows and 8 columns— each represented by a letter or number. The g cell covers half of Greenland, all of Iceland, and …

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Rolling Restart · Elastic Search Definitive Guide

WebRolling Restarts. There will come a time when you need to perform a rolling restart of your cluster— keeping the cluster online and operational, but taking nodes offline one at a …

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Sorting and Collations · Elastic Search Definitive Guide

WebNow our names would be returned in this order: bailey, Boffey, BROWN, Böhm.The reason that Böhm comes after BROWN is that these words are still being sorted by the values of …

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Geo Bounds Agg · Elastic Search Definitive Guide

WebIn our previous example, we filtered our results by using a bounding box that covered the greater New York area.However, our results were all located in downtown Manhattan. …

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Empty Cluster · Elastic Search Definitive Guide

WebOne node in the cluster is elected to be the master node, which is in charge of managing cluster-wide changes like creating or deleting an index, or adding or removing a node …

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Algorithmic Stemmers · Elastic Search Definitive Guide

WebWhile you can use the {ref}/analysis-porterstem-tokenfilter.html[porter_stem] or {ref}/analysis-kstem-tokenfilter.html[kstem] token filter directly, or create a language …

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Wildcard Regexp · Elastic Search Definitive Guide

WebThe wildcard and regexp queries work in exactly the same way as the prefix query. They also have to scan the list of terms in the inverted index to find all matching terms, and …

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Has Parent · Elastic Search Definitive Guide

WebThe has_parent query also supports the score_mode, but it accepts only two settings: none (the default) and score.Each child can have only one parent, so there is no need to …

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Not Analyzed · Elastic Search Definitive Guide

WebThe final topic that we should touch on before leaving multifield queries is that of exact-value not_analyzed fields. It is not useful to mix not_analyzed fields with analyzed fields in …

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ICU Tokenizer · Elastic Search Definitive Guide

WebThe standard tokenizer in the preceding example would emit each character as a separate token: 向, 日, 葵. The icu_tokenizer would emit the single token 向日葵 (sunflower). …

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