82 lines
5.5 KiB
Plaintext
82 lines
5.5 KiB
Plaintext
[[heatmap-chart]]
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== Heatmap Chart
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A heat map is a graphical representation of data where the individual values contained in a matrix are represented as colors.
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The color for each matrix position is determined by the _metrics_ aggregation. The following aggregations are available for
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this chart:
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include::y-axis-aggs.asciidoc[]
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The _buckets_ aggregations determine what information is being retrieved from your data set.
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Before you choose a buckets aggregation, specify if you are defining buckets for X or Y axis within a single chart
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or splitting into multiple charts. A multiple chart split must run before any other aggregations.
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When you split a chart, you can change if the splits are displayed in a row or a column by clicking
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the *Rows | Columns* selector.
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This chart's X and Y axis supports the following aggregations. Click the linked name of each aggregation to visit the main
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Elasticsearch documentation for that aggregation.
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*Date Histogram*:: A {ref}/search-aggregations-bucket-datehistogram-aggregation.html[_date histogram_] is built from a
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numeric field and organized by date. You can specify a time frame for the intervals in seconds, minutes, hours, days,
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weeks, months, or years. You can also specify a custom interval frame by selecting *Custom* as the interval and
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specifying a number and a time unit in the text field. Custom interval time units are *s* for seconds, *m* for minutes,
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*h* for hours, *d* for days, *w* for weeks, and *y* for years. Different units support different levels of precision,
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down to one second. Intervals are labeled at the start of the interval, using the date-key returned by Elasticsearch.
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For example, the tooltip for a monthly interval will show the first day of the month.
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*Histogram*:: A standard {ref}/search-aggregations-bucket-histogram-aggregation.html[_histogram_] is built from a
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numeric field. Specify an integer interval for this field. Select the *Show empty buckets* checkbox to include empty
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intervals in the histogram.
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*Range*:: With a {ref}/search-aggregations-bucket-range-aggregation.html[_range_] aggregation, you can specify ranges
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of values for a numeric field. Click *Add Range* to add a set of range endpoints. Click the red *(x)* symbol to remove
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a range.
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*Date Range*:: A {ref}/search-aggregations-bucket-daterange-aggregation.html[_date range_] aggregation reports values
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that are within a range of dates that you specify. You can specify the ranges for the dates using
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{ref}/common-options.html#date-math[_date math_] expressions. Click *Add Range* to add a set of range endpoints.
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Click the red *(x)* symbol to remove a range.
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*IPv4 Range*:: The {ref}/search-aggregations-bucket-iprange-aggregation.html[_IPv4 range_] aggregation enables you to
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specify ranges of IPv4 addresses. Click *Add Range* to add a set of range endpoints. Click the red *(x)* symbol to
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remove a range.
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*Terms*:: A {ref}/search-aggregations-bucket-terms-aggregation.html[_terms_] aggregation enables you to specify the top
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or bottom _n_ elements of a given field to display, ordered by count or a custom metric.
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*Filters*:: You can specify a set of {ref}/search-aggregations-bucket-filters-aggregation.html[_filters_] for the data.
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You can specify a filter as a query string or in JSON format, just as in the Discover search bar. Click *Add Filter* to
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add another filter. Click the image:images/labelbutton.png[Label button icon] *label* button to open the label field, where
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you can type in a name to display on the visualization.
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*Significant Terms*:: Displays the results of the experimental
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{ref}/search-aggregations-bucket-significantterms-aggregation.html[_significant terms_] aggregation.
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Enter a string in the *Custom Label* field to change the display label.
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You can click the *Advanced* link to display more customization options for your metrics or bucket aggregation:
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*Exclude Pattern*:: Specify a pattern in this field to exclude from the results.
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*Include Pattern*:: Specify a pattern in this field to include in the results.
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*JSON Input*:: A text field where you can add specific JSON-formatted properties to merge with the aggregation
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definition, as in the following example:
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[source,shell]
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{ "script" : "doc['grade'].value * 1.2" }
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The availability of these options varies depending on the aggregation you choose.
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Select the *Options* tab to change the following aspects of the chart:
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*Show Tooltips*:: Check this box to enable the display of tooltips.
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*Highlight*:: Check this box to enable highlighting of elements with same label
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*Legend Position*:: You can select where to display the legend (top, left, right, bottom)
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*Color Schema*:: You can select an existing color schema or go for custom and define your own colors in the legend
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*Reverse Color Schema*:: Checking this checkbox will reverse the color schema.
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*Color Scale*:: You can switch between linear, log and sqrt scales for color scale.
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*Scale to Data Bounds*:: The default Y axis bounds are zero and the maximum value returned in the data. Check
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this box to change both upper and lower bounds to match the values returned in the data.
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*Number of Colors*:: Number of color buckets to create. Minimum is 2 and maximum is 10.
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*Percentage Mode*:: Enabling this will show legend values as percentages.
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*Custom Range*:: You can define custom ranges for your color buckets. For each of the color bucket you need to specify
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the minimum value (inclusive) and the maximum value (exclusive) of a range.
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*Show Label*:: Enables showing labels with cell values in each cell
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*Rotate*:: Allows rotating the cell value label by 90 degrees.
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