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How do I implement caching mechanism of search results as on stackoverflow? How does elastic search and lucene deal with caching?
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Google generates a cached version so that users can still access the web page, for example, if the site isn't available. The cache: operator is only available on web search.
Webpages are cached for approximately 90 days after Google crawls them. How long do cached pages stay in Google's cache? Google keeps webpages in their cache for about 90 days, or until the page is crawled again.
You might notice that when you clear cache, it comes back eventually. This is normal; over time, apps will build up cache again based on your usage. Because cache is useful, you shouldn't worry when an app builds up cached files. Clearing cache shouldn't log you out of apps or cause any other major changes.
In computing, a cache is a high-speed data storage layer which stores a subset of data, typically transient in nature, so that future requests for that data are served up faster than is possible by accessing the data's primary storage location.
As of now, you can cache in two different ways within Elasticsearch
Within Elasticsearch you can exploit these features to attain a good amount of caching. Also, you can explore other caching option external to Elasticsearch to memcache or other in memory caches.
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