Change pattern_text description

Author: parkertimmins

docs/reference/elasticsearch/mapping-reference/text-type-family.md

@@ -11,5 +11,5 @@ The text family includes the following field types:
 
 * [`text`](/reference/elasticsearch/mapping-reference/text.md), the traditional field type for full-text content such as the body of an email or the description of a product.
 * [`match_only_text`](/reference/elasticsearch/mapping-reference/match-only-text.md), a space-optimized variant of `text` that disables scoring and performs slower on queries that need positions. It is best suited for indexing log messages.
-* [`pattern_text`](/reference/elasticsearch/mapping-reference/pattern-text.md), a variant of `text` with improved space efficiency when storing log messages.
+* [`pattern_text`](/reference/elasticsearch/mapping-reference/pattern-text.md), a variant of `text` which is optimized for log messages which contain sequences that are shared between many messages. By compressing these shared sequences, `pattern_text` provides improved space efficiency relative to `match_only_text`.