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@@ -66,6 +66,14 @@ via the <<multi-fields>> parameter.
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[float]
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=== Settings to prevent mappings explosion
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+Defining too many fields in an index is a condition that can lead to a
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+mapping explosion, which can cause out of memory errors and difficult
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+situations to recover from. This problem may be more common than expected.
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+As an example, consider a situation in which every new document inserted
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+introduces new fields. This is quite common with dynamic mappings.
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+Every time a document contains new fields, those will end up in the index's
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+mappings. This isn't worrying for a small amount of data, but it can become a
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+problem as the mapping grows.
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The following settings allow you to limit the number of field mappings that
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can be created manually or dynamically, in order to prevent bad documents from
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causing a mapping explosion:
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Antonio Matarrese